I think that's because that often is a prelude to an attack.

I know someone who mainly asks for explanations or justifications when they're getting angry about something (and it's obvious). There's high chance the next thing that will happen is some kind of outburst (or quiet seething resentment). With them, the question "why did you do X?" almost never has any element of curiosity to it.

Instead of honestly saying "I think you are wrong because..." they passive aggressively pretends they are "just asking questions."

Of course on non controversial topics a question is likely to just be a question.