The issue was thrown into sharp relief for me when I took my son to a swimming pool I haven't been to since I was a child. No changing village. No family change. Due to his age he has to go in the men's alone. This is a first for us. I had forgotten that at this pool the "cubicles" are open fronted, no doors or curtains, and the walls come up to about shoulder height. No privacy.
Now I know my brother sometimes takes his two little girls to this pool. As with my son, they are just old enough to need to go, without their parent, into a changing area with no privacy.
For me, it's not the case that I'm fine with it so long as I'm not actually attacked. I'm not fine with someone getting off on wandering up and down and getting an eyeful of my private bits, or the private bits of my child or anyone else's child.
I don't believe in the existence of anyone who doesn't believe in the existence of men who get off on an eyeful of naked body without consent, or child's naked body, or taking advantage of vulnerability.