Not sure what you mean. If I am to take you literally, what I'm hearing is, "/r/science would be a better subreddit if all critical comments were deleted."

I don't believe this is what you meant, but perhaps you could clarify?

When I use the word "accusation," I mean, "A claim that someone has done something wrong." This could be an accusation of malicious fraud; it could also be an accusation that someone has mistakenly used an inappropriate statistical test.

Is there a particular class of accusations that you think are harmful? Perhaps your definition of "accusation" is different from mine?

Would be interested to hear.