> What change was the person who shot him hoping to elicit?

I think a difficulty in searching for such answers is assuming that it was a well reasoned decision. I'm not sure how often attempting to take a life is a purely rational decision, devoid of intense emotional motivations (hatred, self-preservation, fear, revenge, etc.). And that's all assuming the assailant was of somewhat sound mind.

I think one of the dangers of more and more extreme divisions in society is that those divisions cloud our mental processes, threaten our emotional health, and take away opportunities for meaningful civil discourse. All of which can lead to more heinous acts that we struggle to make sense of. One of the scariest parts for me is that this can all be too self reinforcing ("Their side did this bad thing to our side, let's get them back!!!" repeat/escalate...). How do we break the cycle?