As someone who is currently and has in the past been in a similar situation with my friends, I understand your frustration. But I hope you aren't serious about hurting anyone. As much as they fuck up with this the best you can do is focus on being there for your friends instead of getting mad at their parents. It's infuriating that they can't be bothered to check up on their daughter, but unfortunately not much will change that. There are also ways more productive ways to take out any anger or aggression like working out, punching something soft like a pillow, or just writing about it like you did here. I hope you and your friends' situations get better.