While I wouldn't try to tell someone how they'll feel after they have children (especially with 100% accuracy), I can say that as a parent of two small children, I wouldn't like to see a constant stream of new people constantly coming and going from the apartment across the hall. I've lived in a flat with a shared back yard, and my kids knew the people who lived below us. I knew them well and became friends with them, and I do find the notion that my kids would have been safer around a steady stream of strangers kind of absurd. I wouldn't have wanted a new group of people I don't know hanging out in the backyard where my kids play every weekend.

I personally feel that short term rentals work very well in some places, but they can be very disruptive to neighborhoods as well. I guess it comes down to whether you feel that the preservation of the residential nature of a neighborhood is a legitimate reason to regulate. As you can probably tell from the way I set this up, I do.