It's called ego.
Ego likes darkness and anonymity for such attacks. And ego is lazy, preferring the power of a simple click, to actually writing something thoughtful and on-topic.
We can find the same effect in many aspects of our society.
The puppet masters of our current society thrive on feeding the flames of divisiveness -- Republicrats versus Demopublicans, conservatives versus progressives, climate changers versus change deniers, etc.
We also find it in groups, like the KKK and the private Federal Reserve -- thriving on secrecy and anonymity to do all manner of evil -- like siphoning off trillions of dollars to foreign banks (and individuals?).
Another trick of ego is the use of generalities and false logic -- ad hominem, arguments to ignorance and the like. Carefully worded, even the most illogical can have a seductive feel, luring those who don't think critically into their destructive flame.