One large reason: Black and White thinking. There is no grey area anymore with A LOT of people. If it feels bad, then it is bad to the max and must be dealt full consequence. Or if it feels good, it must be amazing and needs to be idolized. You see it everywhere that the many shades of grey in between no longer exist. BPD is a good example of extreme black and white thinking. (Not saying every person who thinks BaW has BPD)
RE: You can't stop fascism by becoming fascist and you can't beat hate with a ban hammer