Let me reiterate. Violence is not the answer for one reason and one reason only. Once it starts and everyone joins, it will be very, very hard to stop.
edit: be
The gunman made his own gun, in a country with ultra-strict gun laws. The Unabomber made his own bombs. The Seattle mall Islamist knife attacker refused to stay down after being shot multiple times.
My takeaway: political terrorists are particularly motivated. Secondly, gun laws slow them down but don't stop them.
I don't believe this is the same thing.
One is an adversarial problem where a living thinking being is evil and trying to attack you.
In traffic, most people are just trying to get somewhere, and then accidents happen.
There's a long funnel of all the things that could happen, probability of each, and total resulting probability. That's no different for being in a car wreck or being shot at.
Now, on a moral level, sure, malice is different from negligence is different from coincidence.
The motivation is not the important part. Sentience is. This person is playing a chess match trying to defeat you.
Consider biology. Cancer is a hard problem to solve, but it's not scheming against you with an intelligence. What about someone in a lab engineering bioweapons?