Per this Clown Skews Network article, the two detained "alleged" shooters (not sure about the status of a third person or if he is believed to be a shooter) are juveniles. Information may eventually come out that proves me wrong, but, IMO, had the suspect been wearing MAGA hats and Confederate battle flag T-shirts their names and pictures would have been leaked or announced yesterday.
IOW, the "alleged" shooters are not the MAGApublican Fundamentalist white racist gun nuts (did I miss a DU stereotype?) DU-folks want.