Until they have finished investigating the entire matter and finished charging everyone they're gonna charge, you can't really argue that they have selectively charged some and not others ... because they aren't finished with the entire process.
Charges continue to filed, arrests continue to be made ... just about every week.
Now you might quibble with how they are going about their task, and who they choose to charge before others, but you really don't have any insight into what actually goes into those decisions.
I suspect some of it a manpower issue (finite resources) ... but that's not to say that there aren't other factors involved as well.
After all, it is the largest, most complex criminal investigation and prosecution in the nation's history.
You might want to read the following which goes into the reasoning (strategy) that may be being used in how this investigation and prosecution is being pursued:
A TAXONOMY OF THE [VISIBLE] JANUARY 6 “CRIME SCENE” INVESTIGATION
ROTFLMAO ... sure.
The crack
anonymous legal/investigative team over at Revolver is all over it.
Given the loaded and emotional language that they use it's fairly easy to see why it appeals so much to diehard Trumpers.