I think its debatable how ill treated Predacons were under Maximals.
I provided two examples, was there any motive for new school Shredder besides being an evil psychopath? BTAS Scarecrow didn't have a motive beyond being a psychopath with a fear fetish, was he a bad villain? Yeah he was mad at university for firing him, but he got fired because he was psychopath.
Also STAS Darkseid didn't have much of motive, besides being pure evil and he was still a good villain.
Heck Bullseye, the DD villain, has no motive above being a psychopath, is he a bad villain? Heck Purple man doesn't have a motive beyond being a psychopath, is he a bad villain?
To my knowledge Jeffery Damher was never abused as a child, his family only turned their back on him because of his psychopathic behaviour, not the other way around.