I get your trying to be cute, but your example is pretty poor. One can reasonably argue that the Germans were either part of or led by the Nazi party. You could argue there hasn't been a gasing in 50 years. You can argue that they occurred in Europe (maybe you're in Europe, but just in case you're not).
I can't give you any reassurance like that. I can't say that men with college degrees don't do it. That it hasn't happened in the US. Or has happened at all in the past 10 years or even past week.
There doesn't exist an objective measure, that I know of, that I can use to rationally reduce risk. Now I've left this open, and clearly stated "that I know of".
If you can show me a key piece of statistical evidence that I've missed that will make this clear, I'd be happy to see it. And I will make an effort to avoid Nazi daycare teachers.
If 99% of abuse is committed by men but 90% is committed by family members - then worrying that a stranger is man is not logical.
The point of the article though is that an unofficial blanket ban on male teachers - in case they are abusers - makes as much sense as a ban on Muslim airline pilots, or on Germans in uniform.
The data I've seen (and cite/quote in previous posts in this thread) show that only 30% are committed by family members. 60% by out of family acquitances, like teachers, coaches, etc... And 10% by strangers.
Statistically there was a 7.5% risk he would gas the students (6 million Jews/80 Million Germans)