[chief lee runamok]

"Someone that wanted to look inconspicuous?"

I surmise it depends on the rifle left behind. If stolen, clean of prints, then yes,
after the massacre left behind makes diabolical sense.

If a functioning armalite, that would fit the narrative.

[gundog]

Better yet, a ghost gun ....ooooh, scary.

This one’s showing more sense than others. Could actually be trying to get away with it, rather than be captured easily.