I have to agree with you. I don’t understand Flynn’s deal. He’s just sitting there letting Mueller walk all over him (and thus Trump) seemingly unwilling to put up any sort of fight, even as the judge is begging him to do so.
The only thing I can think of is he is protecting his son from Mueller’s assured prosecution and destruction by sticking to the deal that got Mueller to promise that Flynn’s son was off-the-table.
Flynn has been bankrupted. He had to sell his house to pay his legal fees leading up to his guilty plea.
A private citizen has no chance against the full weight of the government. Do not judge General Flynn on this. There are a lot of things he is due criticism on, but this is not one of them.