There are the Trump cases that are objectively easy to prosecute (especially the stolen document case), since the law is clear and no good lawyer wants to represent Trump. Here the DOJ has clearly been dragging his feet for reasons that are unrelated to the legal system.

Then there are these antitrust cases that are objectively EXTREMELY complex, and where the legal arguments have to be very carefully constructed to withstand a challenge from the best lawyers money can buy. Complain about the former, not the latter