No it isn't.

>The only reason to avoid learning the truth about them is that they already trust them

You keep writing this, but that is not a logical conclusion.

And? That doesn't mean they find people trustworthy to begin with.

No, it does not.

You sit around making assumptions from your point of view as if you matter regarding why these people chose to do something.

But why the assumption they believing them to be trustworthy?

You don't have to think your dad are trust worthy to not want to know if he was a part of Gestapo.

There is no contradiction, not everyone was part of Gestapo etc.

What contradictory information?