The root cause? How about articles like these that insult distraught young men who fear their society now rejects them because they are white and denies them the right to their feelings:

“We just want to preserve what we have.” What a tidy statement, one that sums up an eternal tide of white supremacy...These hierarchies are maintained through unjust laws and untold violence, but also deep patterns of belief...Having been raised to believe in their own entitlement, white people are also taught to fear those of us here to “take it away.”...

This delusion has been millennia in the making...Flipping that script is simply the truth, but to many white people, it feels unfair. It feels violent, and so deserving of violence.

I get it, Mr. Cvjetanovic, the undeniable structural truth of global white supremacy isn’t entirely evident in your day-to-day life. You just want to preserve what you have: respect, opportunity, money and power. The bloody spoils of an old and infectious evil."