No, don't call the Police. There is nothing they can do, they are a purely reaction based force who cannot interfere unless a crime has been committed . Leave them alone. Why in this day and age do people not understand that 911 is to be used in emergency situations when nothing else is available?
When did Police Officers became the first response instead of the last response?
"My neighbour is too loud, Call the Police!"
"Someone threatened me verbally, Call the Police!"
"Someone stole my bike, I have no evidence who did it or where they went, I'll call the Police!"
Our society relies far too heavily on Police Officers to do jobs they aren't trained to do. Police do not fight crime, they clean up crime. What do you guys think some Police Officers are going to do about a verbal threat? Arrest him? For what? A crime he hasn't committed? Tell them to leave you alone? Well isn't that a productive use of their time.
/rant