No they are not. That is what happens in the movies, but in reality those people are just like anyone else - mostly nice people. Even stand your ground laws which allow you to shoot without asking questions only apply in specific situations and are unlikely to apply (though without specific details I cannot say for sure)
Sure, small numbers, low statistics, but it is still in the list of reasons why "Americans don't trust cutting through a random field and see only a dangerous road in a picture like that street view" in some parts of the country. The US has a fascinating relationship to "private property".
