There are over 100 Hispanic gangs in the area ~ odds are this is neither an Amish drive-by nor something involving Jihadis.
Would not surprise me, if that is the case, since I am just hearing about it now, it could be say “Mexican”. In other words, with the invasion of the illegals including those who belong to gangs.
You leave in CO by any chance?
Gang bangers usually target each other, irrespective who else might be around and it’s almost always sudden and unexpected.
This guy planned to murder innocents, for maximal casualties. It could be a loner-type, but the use of a car bomb suggests Jihadi.
The only thing that indicates, off-hand, a loner event is that the guy didn’t say, “Allahu Akhbar” before shooting, or at least it hasn’t been reported yet that happened.
(In Atlanta; and elsewhere, no doubt; they were sending long-time, employed; honest workers, Fathers, Mothers, sons; 'home'. . .while they totally ignored the illegals on Buford Highway - with gang tatoos. Why not start first, with the threats; and worry about the 'problems' later? But of course; that is another issue per this thread.)
Or; maybe not; per your posting. . .
Wouldn’t it be something if the shooter was armed wth fast and furious guns.