Trump is probably not striving to become Emperor. He surely knows he's out in 6 years at the latest. But he's exerting effort at stymying all investigations that will endanger him upon hitting the street. He wants his old life to continue, albeit with better financial prospects afforded by having been President.
Presuming he's planning that far ahead, at this juncture. He's consumed in a struggle for survival, just trying to keep the wolves at bay for another day. Risking the piling on ever more elements of obstruction because, in his mind, to not fight means calamity descends sooner. Just gotta get through the day. Connive. Distract. Bully. Flail. Fling poo. Whatever it takes.
For his first real existential threat, his life of never accepting responsibility and his escaping of meaningful consequences is manifesting itself in his petulant victimhood, his projection, and his ready resort to criminality.