Why discussions generate into personal affronts...

Hello to all... I am a new-be in comparison to those who have thousands of inputs into forums/discussions.

I find it disappointing that in reading inputs, I have to waste time in members sniping at each other. Half the time it simply is a difference in opinion that breaks down into nasty idiocy,  and half the time I need some type of reference to past verbal battles fought about in other topics/forums. 

WHAT EVER HAPPENED TO IMHO? Many times spewing personal dogma against each other just confuses simple people like me who are just looking for guidance - not miracles. We all view another's opinion with reservation - nobody's got a doctorate on audiophile experience; if I was to listen to and obey the professionals, I would never had experimented with 12g solid core copper, vinyl-jacketed wire, twisted and used bare wire no connectors -WHICH I AM VERY HAPPY WITH ...

SO: SOMEBODY fill me in why knowledgeable people generate into nastiness in discussions...