On one hand this doubt is good. On the other hand, in my business contacts with gen z workers I find they are very much mentally incompetent, lousy thinkers. They seem to be children as far as thinking goes and they don't understand simple things. For example a gen z recruiter called me about an engineering position; I told them I need more detail from the client hiring manager about his skills needs. Instead, the recruiter had his (gen z also) manager call me. I had to explain I meant the client manager not the manager of the recruiter. These kids seem dumb AF.

In the holocaust doubt case, I suspect that these kids know no history at all. (but it doesn't mean the jews are being truthful.)