Sorry, but snooping the location of spouses and children, unbeknownst to them, is creepy.
It's often not unbeknownst to them. I can track my wife and kid, they should be able to track me and each other (I know the kid can). It's useful.
That said, parents have legal and moral obligations regarding their kids; it seems unlikely minors have much moral right to slip around and have their location hidden from their parents.
Given how common adultery is, the prospect of a spouse being able to find out where you are may be creepy to some people. I don't think the problem there is the technology, though. I don't mind my wife knowing where I am.
Put another way, if people are using the technology to catch cheating spouses or find out where lying kids are slipping off to, I have no problem with that.
Tim's example could just as easily be a case where you legitimately buy a used laptop and now someone is able to track your location.
Yes, but what's the practical significance? Let's say I buy a MacBook and the former owner, a couple years later, happens to notice his account still shows where it is. Highly unlikely to matter.
There is one scenario that comes to mind that might realistically be problematic - someone buys an Apple device, registers it, activates 'Find My' location services, and sells or gives the device to someone he/she wishes to track for some nefarious purpose, and the recipient isn't sophisticated enough to recognize the situation.
My question then becomes how often is that a problem in the real world? Is this taking place much?