Or we could try to accept that everyone makes mistakes and that's fine. Scientific advancement is basically making slightly fewer mistakes.

My bachelor's thesis was pretty terrible and there probably is not much to learn from it for an expert. It would have been helpful to me to read other peoples thesis when I was a student though and maybe that would have led to a better outcome.

At least here in Germany, a lot of the funding to do the research comes from the government. As a tax payer, I'd like to be able to know the outcome of the research. I am sure there are some real gems in there too.

If a student has reasonable concerns, I would be fine with it not getting published. I believe that the default should be that it gets published.