Would anyone agree that she was mentally ill? At what point did she become mentally ill? Why was she allowed to buy guns then? The answer is simple: without mass shootings by the mentally ill, liberals don’t have an argument for gun confiscation. So the answer why a mentally ill girl could buy guns is obvious.
Not mentally ill, gave themself over to evil thought and desire (idolized self, wanted to be seen, murdering hissy fit when didn’t get own way) none of that is mentally ill, it’s selfishness, pride, stubbornnesses etc etc = sin against God, rejected Him and his truth of, then sinned against fellow humans.
the take over of America has been going on in stages. one of which was classifying sin as mental illness in many cases. removed God and inserted “doctors” to drug up people rather than point them to the things God says are best.
Yes there truly are a small amount of people with true disease of the mind, but many many more are just selfish sinners who give themselves over to allow in evil thoughts and let it take them over.