Even more astoundingly awful than posting negative reviews to discredit an author's work to avenge the author's actions elsewhere is downvoting other people's positive reviews. It's equivalent to berating and shaming someone for being happy.
For example, a review posted on Steam today (not by me) contained the following paragraphs:
Currently, the header states "7 of 22 people (32%) found this review helpful". That means that 15 people have thus far decided it's OK to take a big dump on the reviewer's deeply personal connection to the game. Or, equally likely, they didn't even read it before downvoting - which is almost just as depressing.
As the majority of this mob likely consists of teenagers, 38-year-old me can't help but be concerned for the future of humanity. I know there are far more distressing things in the world than review bombing, but on the other hand it's just one more example of the herd mentality so prevalent in the world.
I am trying to raise my children to think independently, but on some days that task seems more futile than others.