Ideology

There are more and more people, some of them scientists, who disagree with those who submit that there is damaging global warming; they say that things are not as bad as all that; that, OK, there is some global warming but it's not going to be catastrophoic. Certainly not in the short term (hundreds of years ahead).
Well these people, whether they are right or wrong, do not want to be heard by "global warmers"; indeed, some of those who believe global warming is disastrous or going to be, not just ignore them but positively make life difficult for them - some are not allowed to speak. And this is supposed to be a free country!
The trouble is that when people get certain ideas in their heads which they believe as "the truth", not only do they wish everyone to believe it but positively despise those who don't.
You get it in religions (especially so in some), in politics (especially so of those on the far left and far right), - indeed, in everything which has an intellectual content.
I recall a Labour MP railing against a colleague who "crossed the floor" to join the Tories; he told him that there was no one more despised than he.
I think he shouldn't have been despised at all. He had, after all, made a considered judgement after deeply thinking about the matter, not like his attacker, believed he was absolutely right and stayed put.
As Hannah Arrendt phrased it: "Nothing so inoculates a person against reality than the hold of ideology."