@rysiek coming from an still overwhelmingly Catholic country, I see a big part of raising kids in teaching them to trust their own mental abilities. I see a lot of religious upbringing centered around inculcating shame around asking _some_ questions you're not supposed to ask even yourself, and doubting _some_ things you're not supposed to doubt. The whole “sinned in thought” idea.
I understand you're talking about some specific context of interjecting someone else's conversation to challenge them, when it's none of your business. Fine.
But if you find yourself doubting stuff, you just are, that's just your mind at work. You might be wrong or inconsistent, and there's always room to improve your thinking.
But I won't ever be teaching my kids any version of “doubting is bad”.