Wow, didn't know about this event happening today. Fuck! Hard to say how this could be prevented without more info. Hopefully they at least catch the driver.

Hatred tends to drive people a lot harder than love in modern society. Someone who loves and is passionate at something might work on it for years and years until they get to their goal. Hate works in the opposite direction. It motivates people impulsively and years of progress in society are threatened by one, or dozens, of events. This is why I think it happened. And stopping it is entirely a group effort that hasn't been fully actualized yet.