I think if you start looking at it too closely, what happens is that magic doesn't really hold up to scientific types of world building.
I don't think a wizard\witch and a Muggle are evenly matched at all especially if the wizard\witch can do wandless magic. The Muggle needs a gun or close proximity whereas the wizard could portkey or apparate out of the situation. Not to mention mind magics like obliviate or worse things.
The new movie, showed some of the reasons
that wizards might fear humans and their capacity for destruction but the reasons to hide seem archaic or because of custom combined with a sense of "Muggles need to be protected from us" and maybe "We could rule this world but we don't want to because hatred\fear of Muggles." One of the main reasons could even be the misguided belief that marrying a Muggle results in blood dilution and less "magical" children or something bigoted like that.
I mean if my child or family member had magic and I didn't I would be slightly sad but also happy at least that they had it and could show me cool things. Like I could still visit Diagon Alley or even Hogwarts with them. And then I wonder if Muggles can see the castle ghosts. I'd try to help my family member by reading up histories and books.