I remember a time - early 50s (or maybe even late 40s) when it was often impossible to contact someone - or even locate them - if they were travelling around the country on holiday, or for whatever reason.
Sometimes, it was necessary for such people to be contacted because a member of their family was acutely ill, and I remember the BBC radio announcements which would hopefully attract their attention - giving their names, the colour, make and registration number of their car, and the approximate location of where they were presumed to be travelling... asking them to contact a particular telephone number, because a relative was dangerously ill.
So, yes - tracking can be a fantastic piece of technology in instances like that, and others mentioned by posters.
But like all new gadgetry and technological developments, there is often a downside when it can be hijacked for use against people, rather than for their wellbeing. Which is why I believe the nature of the individual who has control of such technology is important.
Someone 'looking out' for the welfare and safety of a family member, or wanting to organise specific events, etc, will use it for their and their family's benefit. My ex MIL would've used it as a flippin' weapon along with her equally controlling son!