This is the text of a speech just given in the House of Lords. I dropped material covered already by others (I was the ninth speaker and there was a speech limit of six minutes). For the wider context, and to see why I focused as I did, see Hansard when published.

Lord Harris of Haringey to move that this House regrets the conduct, and toxicity, of debate in public life; of the divisions in society which result from that; and calls on Her Majesty’s Government to take steps to address such divisions.

My Lords, I am grateful to Lord Harris for securing this debate and for the clarity of his and other speeches. (Although I think, regarding Lord Patten’s suggestion, that some of the people who should be there in such a discussion wouldn’t come – or would seek to disrupt it!)

We still admire Benjamin Disraeli for telling parliament that half the cabinet were asses and, on being ordered to withdraw the comment, responding: “Mr Speaker, I withdraw. Half the cabinet are not asses”. Political invective is not new and surely has its place in a free society. Yet words matter. Language is never neutral. And the ad hominem abuse we increasingly witness now simply encourages wider public expression of violent hatred. It is incrementally corrosive.

If the conduct of debate in public life has become toxic, then it can only be because it has been in the interests of some people to allow it to be so. I have already spoken in this House of “the corruption of the public discourse” and the consequences of normalising lying and misrepresentation. Reducing people to categories might reinforce tribal identity, but it demonises and dehumanises everyone else. As Viktor Klemperer recognised from 1930s Germany, a million repetitions of single words, idioms, and sentence structures or slanders become unconsciously assumed to be normal. Think of Rwanda and ‘cockroaches’.

Jo Cox MP was murdered ten miles from where I live. Her attacker shouted slogans about ‘Britain first’ while killing her. Do we think this is just unfortunate? Or do we admit the link between language, motivation and action? I doubt if there was much analysis of the meaninglessness of the phrase ‘Britain first’ and the assumptions that underlie it. But, there was clearly a dynamic between language, motivation and action – language free from social inhibition and language that legitimises violence in the minds of some people.

What on earth is going on here? Was the violent bile there already and the referendum simply opened a valve? Or has the lack of any legal or political restraint actually sanctioned or legitimised the sort of language we hear and read now? This isn’t about hand-wringing wimpishness about robust debate; rather, it now sees MPs fearing for their safety, Jess Phillips MP being openly spoken of in terms of when rape might be deemed OK, people voicing violence that would have been deemed unacceptable three or four years ago, but which now is normal. This poses a danger to our democracy and corrupts the nature of our common life. It is not neutral and it is not trivial.

Classic populist language – of Left or Right – uses simple slogans, divisive negativity and visceral emotional pull. The accuracy, factuality or truth of what is said is irrelevant. Such language is powerful and effective … and apparently accountable. What are Nigel Farage’s policies for the construction of a post-Brexit United Kingdom? Where is there even a hint of any responsibility for the future other than a rejection of the past. Just one simple message supported by a whole set of angry assumptions. The language is all of ‘betrayal’. The culprits – the enemies – are those who are not them.

This is viscerally emotional and not rational. Reality, truth and factuality are of no concern. Complex questions are reduced to simplistic binary choices. And it works.

What we are witnessing is a trading in the language of victimhood: [if I am a victim of other people’s power, then my bad behaviour is at least understandable, if not completely justifiable]. And everybody is now a victim. All sides of the Brexit shouting match claim to have been betrayed: hard-brexiters by soft-brexiters; remainers by leavers and leavers by remainers; ‘the people’ by the ‘elites’ and the establishment by the people. And everyone by the BBC. The ninth Commandment is there for a purpose: “Do not bear false witness against your neighbour.”

Surely only satire could see old-Etonian Oxbridge-educated senior multimillionaire politicians complaining about ‘establishment elites’ as if this term of abuse referred to someone else? But, no one laughs. And they get away with it. But, it is not a great leap from this to the sort of conspiracy theories that have brought anti-Semitism back into polite conversation.

When politicians speak of the PM “entering the killing zone” and “taking her own noose” to a meeting, we are in trouble.

The German philosopher Peter Sloterdijk writes that the nature of our public discourse matters because “moral and political aberrations almost always start with linguistic neglect.” Edmund Burke understood the powerful influence of abstract terms such as ‘liberty’ or ‘equality’ which have the power to move people without enlightening them.

We might be entering a dark age in these matters. But, we can put our own house in order and lead by example – for instance, by promoting a greater sense of responsibility among institutional and political figures who influence the public discourse; by making people who use such speech publicly accountable; by offering counter-narratives that ensure that our children hear something good and witness a discourse that is respectful.

We need strategies for addressing this and we need to start here, with politicians, in Parliament.