Pretty sure the MSM were the only ones covering it as thoroughly as they did. FOX was more concerned with getting Trump off the hook in Georgia. They must have assumed some MAGA nut was responsible, or they certainly would have done a better job in reporting it.
Here's a snippet from CNN, clearing any MAGA terrorist:
The shooting appears to have been a “dispute between several people that ended in gunfire,” Graves said, noting there is no indication of a “nexus to terrorism or homegrown violent extremism.”