That heroic dad not only saved lives, he also saved money. It's much cheaper to put someone in a casket than to put someone in a prison cell.
Here's something else. That heroic dad delivered what the criminal justice system couldn't: the death penalty. You have to be 18 to get the death penalty in the United States, and that mass shooter was only 16.
Cops in Italy are treated well because they get Lamborghinis. And they're not only used for pursuits, they're used to transport donated organs as well.
Police could use more funding and better equipment, though. Another way to help is by getting rid of activist judges and replace them with judges who are not afraid to dish out "cruel and unusual punishment".
And we also need to get rid of Child Protective Services. For some kids, a smack on the rear end is the only way to end their bad behavior.