So far, it seems the major point here is that this individual was 'mentally ill' & chose to act out his vicious psychopathic insanity on a group of innocent Sunday morn Christian Worshippers.

This psychopathic murderer certainly seemed to know how to run & drive hard in order to save his own skin; the guy was cunning & insane; his act of mass murder speaks to the facts, not his group affiliations.

To generalize this to a 'political group' of Americans is both mindless & reductive to the Americans who were murdered along with a defenseless infant & children.

Further, contrary to your inference -- the colour of skin plays no part here -- only the hard-wired psychopathic impulses of a deranged screaming human-brain on fire to kill as many unsuspecting ‘Innocent Humans’ as possible all the while expecting to get away with this perverted act of mass murder & slaughter..

Finally, though he didn't expect to encounter resistance, he did  -- to where he then became the hunted & died..