What do you think about me scaring people who run red lights?
Why do you want to scare people who run red lights?
I want to instill a fear of death on those who cross on red. It's great fun!
You want to be able to frighten those who do not practice safe driving laws which is fine, but you need to call the cops after taking their license plate #. That is the best way to handle it rather than scaring people. They will be scared either way but you will be free from taking the responsibility of it by choosing the police to do it.
I don't need the cops, I can do it myself.
You can just let them know that running a red light is wrong, because it is! You're in the right there, but it may be a bit weird if you scare them. Try just making sure they know it was a red light and that what they've done is wrong?