What is it about politics that makes people go insane?

I think it's because people think they know whats best for their country\world and will fight to the death to enforce their ideas. in general I dont talk politics to anyone but a select few. I rarly post in here but I saw this and thought why not. back on topic people belive (in my opinion anyway) that their right and everyone else is wrong and it is that which makes politics a such a hot topic for everyone. a conversation between two people are fine as long as they keep their mouth in check and they know each other but when other people join in from 2 tables away (personal experiance here) and starts shouting that your a f***ing idot and you dont know what your talking about it not only disrups the place but puts people in general in a bad mood.
but maybe thats just me

Jam it back in, in the dark.