Deep State provocation
Another alternative is that its a local county DA in New York (in this case Alvin Bragg) pushing this case to the edge, to burnish his leftist credentials and get his name in the news.
Using progressive-left-lawfare is how political whores in DA and AG offices in NY have risen up to Governor for the last 40+ years. Add in a bit of Al Sharpton for color.
Bragg will go as far as he can, until someone higher up decides its not a good idea and shuts him down.