Right, lots of politicians are guilty of a lot of things. Lots of bureaucrats are guilty of a lot of things.
DOJ doesn't do anything unless it is politically expedient to do it. Right now Trump has announced a run for president and the country doesn't want him in power, but there is a very large contingent of Trumpers that will only vote for him. This means no matter who the Dems run will win. So, Trump won't be prosecuted unless the establishment decides he can win.
The government is as corrupt as can be and has been for years.