You can't live on yellow all day every day. Could someone jump out of a tree and jack me up? Sure. The chances of it? Slim. Chances if they did it that they'd be on the ground too? Better.
Dudes could climb into my bedroom window at night, even up 3 floors, but I don't lock my window at night. Why? Risk assessment.
If you spend your time looking at reflections in mirrors, checking trees and looking behind you all the time, you're going to trip and land on your face. ;) Being aware is not the same as being paranoid.
As a heads up, even in the jungle I never had someone jump out of a tree -- stupid monkeys that would steal our cigarettes and throw crap at us? Yup. Tree climbing hoodlums? Nope. Sure, look up in the trees if you feel the need, but when you're scanning for SA, you should be watching for danger, not expecting it. There is a huge difference.

