I mean, sure, he was likely abused by his father throughout his whole life, but we should also remember that he’s a psychopath who almost killed 4 people and only “helped” Gary in order to get his dad’s approval for once in his life. Within the third act, he proved to be nothing but a groveling, traitorous bootlicker, although I could see him trying to redeem himself later down the line, but I highly doubt that the people he nearly murdered would forgive him so easily, especially Gary. I’m sorry, but I don’t even think that adorable pit viper would instantly forgive Pawbert, the young man who poisoned Judy in front of his own eyes, almost instantaneously.
I’ve also seen fans of his say that the writers were too harsh on him, which is kinda BS imo. I mean, he’s a villain, right? Because of course he’s gonna have the shit kicked out of him, especially by the people he betrayed. It would be like saying Mace Windu was too harsh on Palpatine for reflecting his own force lightning back into his face with his lightsaber and frying it like bacon on a skillet.