It's just the nature of the internet.
The same thing happens on all websites, youtube, reddit, whatever.
You can start off with the most harmless post like, "which are prettier violets or roses?" and it will inevitably descend into a shit fight "of course roses are prettier you fucken nigga faggot mother fucker pedo" And then the response "Violets are prettier you fucken redneck, Jew, Nazi, bum fucker" and on it goes ...
