I don’t really want to go on a rant here but id say that yes, both rescues and shelters can have a problem. There are also some that dont. From my experience i don’t see much right vs left politics at play.

Biggest thing imo would be to just vet any rescues you adopt from. Rescues may have received money to pull an animal from a shelter. Make sure they are giving updates on animals under their care. If they aren’t doing that then be very skeptical.