Just be avoidant and aloof around them like I do. I don't even know how to interact with kids, so it's easy for me. I worked security at a large building open to the public a while back and a lost child situation is the one incident I would have refused to deal with for reasons you describe, and we dealt with batshit insane homeless people on a regular basis. At most I would have gotten a female coworker or supervisor to handle it.