It's well known that the judiciary at the time was very lenient towards right wing extremists. His time in jail was rather cozy and gave him time to develop and write down more of his ideological underpinnings. And come up with a more comprehensive plan for taking over.
That's why I find it very worrisome when people like Donald Trump get what amounts to a slap on the wrist for staging an insurrection. Not just that but they actually put him on the ballot again 😱. And this time the people propping him up in the background came up with an elaborate plan for claiming the election and then completely restructuring the executive authoritarian style (aka Project 2025).