Of course they may be nice, they be may be completely innocent. But ime, they never ever are. Like a pp said, it never rarely ends well.
Sabrina, this is desperately sad. I've had at least my share of assaults, harassment, robberies & rapes, but have also had many, many more harmless interactions with strangers. Some have even been downright pleasant! I'm so sorry your experience has been this negative.
Before anyone tries to make me a poster girl old woman for Talking Merrily To Strangers - I am always cautious, sometimes confrontational, and do keep my distance at first (but have still succumbed to bad intent.) It's just stupid not to be cautious of people you don't know. But also very limiting to be frightened of everyone.
I can't think why a person, who needed to ask directions from the only other human on an empty street, wouldn't do so from a safe distance. I would! If he went running right up to her, or was crawling his car level with her, then he had lousy boundaries at the very best.