SR

" Are you really saying these had no impact on the unstable, vehemently rightwing mind of Cox's killer?"

That's your evidence? That's your argument? That vigorous public debate must have trigger this chap because...reasons.

Meanwhile in the real world, there isn't the slightest evidence that Brexit played any part in Mair's 'thinking'. So little in fact that the prosecution didn't even mention the referendum in their case because they had no evidence that was a material factor.

Using the same 'thought processes' I could argue that the rampant anti-Rublican language of the left trigger Hodgkinson in his assault on Scalise et al.
"In 2017, the obsessive hatred of Trump led, for instance, to many obscenities: Madonna told us she dreamed of blowing up the White House, comedian Kathy Griffin posed with a bloody facsimile of Trump’s head, Snoop Dog shot a Trump likeliness in a video, a Shakespearean company ritually stabbed Trump-Caesar every night on stage, Johnny Depp joked, “When was the last time an actor assassinated a president? … It has been a while, and maybe it is time.”

Not to mention Democrats constantly calling Trump a traitor, Hitler, the Republicans Nazis, threatening impeachment for...reasons, a Putin stooge (while being a fascist!!) and so on.

And unlike your mere assertions, Hodgkinson actually was a Democrat and a Bernie (Sanders) Bro