Pretty much this, my mother would always say I'm not worried about you, I'm worried about others. This went for most things during childhood, walking home from school, driving a car etc
This has gone all the way back to around 2007 as a free roaming kid
The sad thing is that constantly tracking the child won't help with these problems. If someone wants to murder a child, a tracker watch isn't going to stop them. If someone wants to kidnap a child, a tracker watch is going to be ripped off and discarded (along with a smartphone, if they have one).
Most parents that I know are scared that their children will be victims of violent crime. They may trust their kids explicitly and implicitly, but do not trust the world.
I blame 24 hour news, to be honest.