Tldr; The domestic terrorist was already a felon pre-Jan 6, and was arrested for possessing firearms as a felon.
A prime example of the type of being he is:
He had at least three previous felony convictions — one dating back to 2017 for domestic violence battery by strangulation and two in October of 2021
prosecutors accused him of using an explosive device to assault officers trying to protect the Capitol in the Lower West End Tunnel. Ball further was allegedly seen on video joining rioters in an unsuccessful attempt to break through a police line, before retreating to throw "dangerous weapons" at the line of officers, according to court records.