The problem is trust. Were you yourself there to witness all controversial events? If not, you have to rely on the testimony of others and trust that they're not lying and have not themselves been tricked.
Edit: See what I mean? I didn't question anything, I just brought up questions about questions and people judged me for it.
I dislike that we are in a race to create a ministry of truth(it's ok we will only silence the baddies).
Somewhere else in the thread a poster thinks we should not engage with these ideas as it fuels them. I think censoring the idea engages with it more than letting it be taken apart and ignored in the public view.