This Sub Is Disheartening

I always thought I would have a family but I got a late start and now it's too late for me. My husband and I started following this sub a couple years ago and honestly, it's scared the shit out of us.

There are so many angry people on this sub and I don't understand why. Why are you mad at your adoptive parents for adopting you? I'm seriously asking.

It comes off like no one should adopt, and I seriously don't understand why. There will always be kids to adopt, so why shouldn't they go to people who want them, and want a family?

Please help me understand and don't be angry with me, I'm trying to learn.

ETA- my brother is adopted!