They always blame a substance.
I think it’s a little of all of the above, sparked by feelings that the government is not doing its job protecting our borders. Young people can respond too emotionally to such things and end up using “righteous indignation” to justify taking matters in their own hands. I bit of the concept in the movies “Death Wish”, but more sparked by the news media and video games combined.
Blaming video games is as stupid as blaming guns.