Yes, obviously, but you know as well as I do, the kid probably got his attitudes in the family.
No, probably he didn't get his attitudes in the family. Do you think the grandmother that the Uvalde shot in the face gave the kid the idea to go shoot up a school?
No doubt, some kids learn bad stuff at home but many millennia of human progress show that children mostly learn good things from their parents and families.
Where children today learn to hate and develop the mental health problems that lead to shootings or planned shootings is in the schools.
White children are told they're evil and the cause of all that's evil in the world. Even when they don't believe they're actually evil, what do you think it does to a kid's psyche when he realizes that most people in the school, including teachers, students, administration, and even many of the white kids, hate him because he's white?
If he does believe the lies that he was born evil, what do you think comes from that? Repentance? Or living up to expectations? I've learned in my life that most people live up to expectations. Mostly I've learned that setting high expectations leads to delivering high results but setting low expectations leads to low results. I suppose that setting evil expectations must lead to evil results.
These same lessons of hate in the schools lead to black on white violence as well. When a child spends his formative years being told that white people are evil, that white people hate him, that all of his troubles, his families troubles, his entire communities troubles, come from white people, then, as someone already pointed out in this thread, no doubt black kids talk about shooting white people, too.