I sometimes watch the ANIMAL PLANET shows about "animal cops" and rescue. In some of those episodes, the humans mean well, but have "problems" [elderly, mental illness.......] that respond to intervention by professionals. I would add that there is an ignorance-factor [IOW, "I didn't know any better....."], but give me a break.......
I do kinda feel sorry for the hoarders, though -- most of the time they really do love the pets, and believe they are doing what's best, but get overwhelmed.....
But 90% of them are just dirtbags! They have no compassion. They are totally selfish with no regard for the feelings of any other living creature.
The ones that anger me the most are the people who "mistreat" an animal but CAN'T SEE that the animal is being mistreated / injured / tortured / starved / etc. They argue with authorities.....they've been feeding it every day [emaciated animal, near death -- yeah right!]....or.....it didn't look like that yesterday [imbedded collar or badly mangled limb -- yeah, right]....or....someone else was taking care of it, etc., etc. And they actually try to regain custody of the animal!