>>Gun utility: small Car utility: large
It's not about cars but speeding in cars. You can eliminate one without the other. This is not the case with guns. Utility of speeding is negative even if you never kill anyone.
That's like saying "it's not about guns but killing by guns".
If we could only identify those pesky people that will kill with their guns before they do it, we could solve our problem! Just as if we could separate out only the drivers that will crash before they actually do it.
Alas, while you can probably speed many times without serious consequences, shooting someone without serious consequences is far rarer! This means we at least have a chance to catch the repeated speeders before they do irreparable harm, but we rarely have the same luxury with shooters.