You do realize that federal law applies to the January 6 "group" because the capitol building is a federal building? Assaulting a federal law enforcement officer is also a federal crime. I see nothing improper in charging them under federal law given the facts of the cases. You are of course free to be upset about it.
"Most of the arrests for the Jan6 infractions were for misdemeanors and minor felonies yet the majority of them are still in D.C. jails.'
This is factually incorrect.
>>At least 70% of people charged in the Capitol riot have been released as they wait for trial, according to a Guardian analysis. That high pre-trial release rate stands in stark contrast with the usual detention rates in the federal system, where only
25% of defendants nationwide are typically released before their trial.<<<
At least 70% have been released as they await hearings – compared with a typical rate of 25% of federal defendants
www.theguardian.com
If you do not believe that article, here's a link to the status of the defendants. I have not tallied the status of each and every defendant, but an initial scan suggests that the majority are out on personal recognizance (no bail required).
www.justice.gov
You also consistently downplay the seriousness of the charges. Here's an example of the charges against one defendant, a Craig Bingert:
>>>Obstruction of an Official Proceeding and Aiding and Abetting; Assaulting, Resisting, or Impeding Certain Officers; Civil Disorder; Entering and Remaining in a Restricted Building or Grounds; Disorderly and Disruptive Conduct in a Restricted Building or Grounds; Engaging in Physical Violence in a Restricted Building or Grounds; Obstructing, or Impeding Passage Through or Within, the Grounds or Any of the Capitol Buildings: Engaging in an Act of Physical Violence in the Grounds or Any of the Capitol Buildings <<
www.justice.gov
As you can see, he's out on personal recognizance. Are these charges examples of what you mean by "misdemeanors and minor felonies"?