One more point that I think is germane here.
In the early days of the Obama administration, a lot of folks, myself included, were disappointed that the O admin made it clear there would be no investigation of Bush-era policy on torture, detention, and rendition. Speaking for myself, it wasn't that I wanted to see people strung up, but more that I wanted some kind of "truth and reconciliation" situation... but plenty of people did want to see folks in the dock for it, and with some good reason.
O admin made it clear that they believed that it was inappropriate to investigate one's predecessor in that way.
Seems pretty honorable and quaint in retrospect, in light of what you're suggesting.