I know there are aerial trespass laws. Mostly used to prevent utility companies from running service lines across private property to service another private property. I just don’t know how many feet up before its no longer considered aerial trespass. 150’ would seem reasonable. How high are cell towers? Property owners who have leased space for cell towers should set the standard height limit for aerial trespass. ......but yeah, if I saw a drone hovering over my daughters...close enough to “shooed” away by them and then it returned, it would be taken out by any means necessary...then I wait to see who will come to pick up its fragments.
We might keep high-resolution, zoom cameras in mind and make it 200 feet. That might also put them in other airspace above private properties, which could eliminate them over private properties not owned by the hobbyist. Will need to have another look at law on the minimum altitude, though.