Why do so many negative people edit Wikipedia?

Lately I've noticed a several people around Wikipedia whose only purpose seems to be to criticise and take offence at every single thing that goes on. These people range from new editors, to admins who have been here for years.

For example: there are numerous editors with a ridiculous idea that admins are out to "get them". To them, Wikipedia is an online battle: the fight between the editors and IRC admins... utter nonsense. It is certainly childish playground mentality at best. There are no gangs, for goodness sake.

There are other editors whose purpose is to act like some sort of martyr amongst their friends. Deliberate trolling is stuck up for under the guise of "opinions are allowed", and when the troll is blocked, the troll is made out to be a hero. Madness.

Then there's the infamous requests for adminship page. This is the best place to find negative people - just look at the oppose column on any random RFA! OK, not all opposes are dumb. I actually saw a fairly decent oppose today, based on age of all things. It's fine to oppose people - I've done it myself, numerous times. The problem is, the ideology several people have. They actually come to the RFA looking for reasons to say "no". Unbelievable - it's not like we have a limit on how many admins we can have. What's wrong with being positive, and looking for reasons to say yes? I simply can't understand the negativity of some people. And then, there's the opposes themselves. Let's face it, many opposes are scraping the barrel. But when such opposes are as blunt as "No frickin' way", we have problems. What an insulting way to say no. How completely unnecessary. Yet, people do it.

The negative people on Wikipedia are thankfully a minority. Most of us edit for fun, and have a good time doing it. We don't go looking for fights, or enemies to make, and we get on writing articles or whatnot. I hope these negative people aren't as angry and sour in real life.