What's the root cause of all this? You can't fight gun violence without knowing this...

[anarch]

3. I suspect a lot of it is a feeling of hopelessness and nihilism among the youth

because of the obviously impending doom of the climate crisis, and the grinding alienation of capitalist society. The younger generations have a number of valid reasons to feel like their future is going to be truly fucked, and nobody is doing anything about any of it, they feel powerless, and one way to feel like you have power is to lash out at the world and do as much damage as you can before you go out in a blaze of glory. Our society is truly sick.