It's a bit of group think. I noticed in on Reddit and on Lemmy it's the same. You easily downvote someone if they're already very low and the statement is not welcome in the current context.

Some of my reddit posts why <-200 are the ones I'm most proud of, e.g. one where I stood against torture and death sentence, even in the context of a child rapist.

Probably many people just thought you were "just asking" to spread doubts instead of… actually wanting to know a source. Don't think about it too much :)