This will be remembered as a tragic event, but it won't lead to any real change. Most regular people who disagree strongly in politics never get close to violence. They usually don't want to talk about their differences, but even without talking they have no violent notions.
The exception is of course the extremely small amount of people who are both deranged and so worked up about said differences that they would kill. The guy who killed the health insurance ceo comes to mind. Then there are hit for hire types, who are psychopaths, doing it for money.
I do think that less divisive rhetoric and more courteous disagreement would lessen this type of extreme violence and also reduce lesser forma of violence such as what occurs at various protests.
Unfortunately I don't think improvement is possible. People are too divided and the changing demographics will make it worse. National unity can only be superficial. Getting people to rally behind a flag or anthem is doable, but it won't bring any unity on anything deeper. All throughout Western countrues crime is rising. We will simply become more and more like shitty South American countries.
Hope I'm wrong, but this seems like the most realistic trajectory.
