You can’t regulate them against every little thing you disagree with the parents with. It’s not practical. As long as the parents are shomer shabbos, kosher, basically frum etc what else can you do?
You can’t exactly interrogate each parent to see how militantly feminist tv has made them and the like. Unless they wear it on their sleeves.
You can’t exactly interrogate each parent to see if they subtly treat each child worse or better or if they would save your kids life behind others based on the misha in horayos.
Can you?