It’s not so easy in Germany when the company has 10+ employees. You need a process consisting of warnings, giving time to correct the behaviour and what not. There are cases where people who have been terminated for sexual misconduct or stealing have been ordered by the court to return to work.

Sure it is. I suspect the reason that you didn't provide any details from those cases is that the judgements wouldn't be surprising if you did.

If you really want to be able to get rid of people willy-nilly in Germany, use subcontractors and 'rent' the labour you need.