Why is the internet always used as an outlet for people to vent their BS?

[EverQuesting]

this is quite evident on news websites (the propagandist's delight).
For instance i was just on a new website reading an article as you would do, and at the bottom is usually a comment section, and always when it is a controversial article, people always take it upon themselves to vent their bs by leaving absurd and asinine comments that really beggars to belief if they actually believe what they right, since it sounds so irrational and incoherent.

 

[DAVE]

I do this some times to..... People need to vent... to much frustration and stress

 

[KathleenF]

The internet is anonymous, you have a screen name and often no one who knows you sees it unless you mention it. Easy just vent and leave...