What would you do?

It's 3am, you're awaken by your dog barking and a stranger knocking at your door...
You're driving down a desolate highway and see a car with it's hazards on and hood up...
(we aren't story telling- these are real experiences)
Are you scared?
Do you help?
Is your gut reaction right?
Should you be on high alert?
 Are we "just being smart," or are we living in fear, preventing us from helping one another?