Private
Oh no, not the same at all, at least not without terrible over-simplification. The Nazis are muggles, fighting other muggles without magical involvement, and it is over land - you have heard the term Lebensraum? It is only such a disaster for the magical community because of the scale of their destruction. It is increasingly hard to defend the idea that they should be left to govern their own affairs when half of London is in ruins because of them.
I am not so sure about Grindelwald. No matter how powerful a wizard he is, he still requires the support of others, and those who support his belief that muggles are so inferior that they should be enslaved would likely not agree with the same being done to ancient pureblood families like my own.
It is understandable. It is a very long time since you were a child yourself. But I promise that he won't be a bother to you. I'll tell him to keep his distance.
Is it true that they cannot enter the home of a witch or wizard except by direct invitation?