This misses the history of weblogs; in which a new weblogger craves attention and goes sensationalist. Most would pass through this testing period unscathed, but a few would find themselves up against a wall - to be the pre-internet 'unknown' person, or be the popular internet troll? A percentage would troll-ify. Some would even go on to make money at it.
It's more a question of low self esteem, in my book. Everyone wants to be loved and admired. Funny method of doing it, at the expense of others, but we live in an accelerating 'me first you last' culture now.