It's the internet, dude.
Slightly more serious: lots of people aren't interested neither on rational discussion nor free exchange of ideas, they are in the game to either boost ther egos, propel their agendas or proselytise (sp?). Additionally you need to factor in the guys who get a rile out of trolling, flaming, attention whoring and other standard internet behaviours.
AKA it's the jungle! Have a banana.








