Can I ask my neighbor to stop leaving threatening letters on my porch?
Why are you so sure that it is your neighbor?
I don't know who else it could be. Last time I caught him.
So it is him! I do not blame you for wanting to make sure that your family is safe in your own home.
I am tired of this shit. I'm an adult and want to do things my way. Fuck him.
It sound like there is a lot of tension between the two of you. You both want to get what you want and your families will end up suffering for it. Make it clear that he should stay off your property and that you will stay on yours.