Any complaint without data to back it up would be thrown in the trash pile.
In any case. It's a worthwhile experiment to try because it can't make your life worse. I can't really imagine anything worse than being compared to Hitler and Stalin especially if all that person is doing is just venting their anger. I'd want to avoid being the target of that anger and I would require mathematical analysis from anyone that claimed to be justifiably angry to show the actual justification for their anger. Without data you will continue to get hate mail that's nothing more than people making up a story to justify their own anger. And you have already noticed the personal narrative angle so I'm not telling you anything new here. The data takes away the "personal" part of the narrative which I think is an improvement.