Technically: They can do w/e they want with their kids, as long as they aren't forcing it on you or your (possible) kids.
Logically: No, they shouldn't be bringing their kids to 17+ movies. I look back at PG-13 movies now and see tons of stuff that I can't believe got past the rating, so let's not even dive into R(17+).
Personally: I find it really weird, and not the kind of parenting style I'd want to give to my kids, but again, it's their kids, their lives, and I have to respect that. But yea, still weird.
Logically: No, they shouldn't be bringing their kids to 17+ movies. I look back at PG-13 movies now and see tons of stuff that I can't believe got past the rating, so let's not even dive into R(17+).
Personally: I find it really weird, and not the kind of parenting style I'd want to give to my kids, but again, it's their kids, their lives, and I have to respect that. But yea, still weird.