This is not a simple issue, FNG, I suspect that the Ju87 has no special merits as a flying machine and in common with most military types is probably a juice monster and difficult to look after. Having aircraft flying is a great way to bring history alive and educate people-and that is a big part of not forgetting.
Axis a/c certainly do have a place on the airshow circuit, although I am not a particular fan for obvious reasons.