1: Admit to himself that he was incompetent, stupid and greedy. Admit he wasted a huge opportunity. Admit he may well spend the rest of his life in jail. Admit others tried to stop/warn him and he ignored them. Accept that the buck ultimately stops with him. Accept that almost everyone now has to testify against him.
2: Keep pretending nothing happened and everything was overblown and pretend people will eventually realise this despite all evidence and logic.
I see a surprising number of people pick option 2 in this case. And it often works: people get bailed out. Everyone loves an underdog. I don't think it will happen for SBF. But it's a weird mix of flawed and brazen logic and group and individual Psychology and politics...