If the social media posts of family are anything to go off, this is a young boy who grew up with domestic abuse and emotional neglect in the very least from a male authority figure and then had a highly anxious female to guide him thereafter. Some boys don't escape the pattern and merely copy what they are subjected to so they can have the power that was exerted over them. We all know those kids who went to school with us and were little sociopaths that were conditioned for a path we normies shudder at. Wouldn't be surprised if he was groomed into it as its an election year but some kids are just angry at the world and damaged beyond repair, and that pain needs to come out somewhere which ends up being explosive like this event. Hard to know. RIP to these people who paid the price for this kid's unresolved anger and damaged brain. Don't give your kids unregulated Internet access.
Maybe more important: choose who you have children with very carefully, fix yourself if you have problems either being abused or committing it. You don't even need to be beating or neglecting your children directly, they just need to see or know it's happening in their home to permanently dysregulate their nervous system and brain development. There's plenty of resources on YouTube to learn about narcissistic abuse, which is being hurt by people who cannot feel empathy. They only value power, control, and themselves. Understanding the spectrum of antisocial personality disorders is also really helpful to escape and recover from being in close proximity to these people you cannot easily get away from.
This family dynamic is CRAZY common, by the way. I'm sure many farmers can vouch for that. Countless boys grow up in this situation where they go on to abuse women themselves, become hyper aggressive and switching between cold/rage, usually get hooked on drugs and petty crime, and their sisters become abused themselves or incredibly narcissistic to cope. Horrible stuff. Very common. Causes C-PTSD in childhood which permanently fucks them.
I say this not to pity or justify the shooting, but that this map is already pointing to the root cause of so much pain in modern society: broken people in survival mode are damaging vulnerable children in volatile homes that operate on daily dysfunctional reactions to fear, pain, anger, and stress.