Feel free to dial 911 and die if you wish. For a trespassing call it's likely to take hours for them to show up, if they do at all. The guy had already been shot, when he called for help. They did as you suggested, and six are dead. Acording to the survivors, all they did was tell him it was private property, and ask him to leave.
Do you think we should have just called the UN after 9/11, and waited for them to take care of it?