Is anyone proposing without access to an AR-15, or any firearm for the matter, this mentally-troubled yet ignored by all the appropriate authorities youth would

Is anyone proposing without access to an AR-15, or any firearm for the matter, this mentally-troubled yet ignored by all the appropriate authorities youth would not have lashed out violently? It's not too long ago homemade explosives were a seriously real threat in this nation (and others with much more strict regulations, such as the UK). Mass knife stabbings aren't that uncommon around the world, and driving a vehicle through a crowd remains one of the most effective means of violence readily available. The point is... the tool isn't the problem it's the person. It's a figurative band-aid to think we can solve mental health issues by taking away objects and ignoring the actual core problem... which is mental health. Stable, mentally healthy people do not commit these mass violent acts. Full stop.