Its 5 in the morning, woke up at 3 after a four hour nap. The day hasn't begun and I'm already sick of this shit. However, I just thought about this.
I can be mad at Abbadon for this mistakes that he made, but I can't hate him forever.
Abbadong saw too much of his kin either die or become corrupted, this even included someone he loved on a personal level. He knew he couldn't get them back, but he believed he could get revenge for those who have fallen as well as serve justice for hells crimes.
He also seems the type to take his duties extremely seriously. He possibly saw it as his personal duty to avenge for those that were under his care. However, he did not want to end up like Rochelle and H. (Cant remember his full name at the moment, brain wants to say its Hecarim but that's a league of legends champion)
His plan would have succeeded, had either Lucifer not been cunning enough to thinking five steps ahead of his enemies. That is IF Lucifer didn't get a gift from the tree of knowledge.
I don't think he was given much of a choice when he was asked to join hell either. Two factors.
He most likely realized he fucked up when his men began to fight hell on earth, meaning his initial plan failed. Failure in this ultimate scheme meant he failed his ultimate duty of protecting heaven and avenging those he had loved leaving him feel hopeless, helpless, regretful, and scared.
Lilith was asking. Because Abbadon knew that the one he had loved is dead, was ready to move on, but hadn't realized that someone loved him on a personal level it was easy for her to manipulate him onto her side.
I don't think he wanted to destroy heaven, even in his draconic form. I think he was waiting for someone to right his wrong.
He didn't look to Uriel in Hope's for her to save him. He looked to Uriel in his final moment with newfound hope that the hellguard will be redeemed and gratitude, also knowing that he had paid for his sins.