Why not? Did the Dems look for crimes committed by Dems? Did they ever prosecute them? What Dem did they prosecute for lying to congress? None that I know of so I guess we need to play catchup. Hopefully, there will be time to prosecute the Republicans as well. They deserve it. But, it is best to start with the Dems first. Of course if the uneducated judges who have never read the Constitution or think it is irrelevant keep bringing lawsuits that the Supremes have to throw out, the DOJ won't have the womanpower to get to prosecuting the Republicans who so sorely deserve it.
You seem to think that what goes around doesn't come around. Well it does