Due Process had already been played out for DJT's 'concerns' re: a Free and Fair 2020 Election...
...it didn't take a genius to question the purpose of a Rally in D.C. on the final day of the process for peacefully deciding the transfer of power. The FBI...and others...had already figured it out, so having sources there to better understand what was actually going on, was definitely in their purview. Too bad you're disappointed that the Insurrection failed...but all is well for you now that Your Felon, Rapist, Fraud. etc...under the influence of our worst enemy...got back to the WH.