It's not the manufacturer's job to combat theft of their devices.
There. That says it all. But try to explain that to a government official obsessed with running everyone's life - asked or unasked.
Apple's location service is already pretty neat even it all it does is protect my data to some degree. For everything else there is insurance if it's worth it. Or the 2nd amendment..
A "kill switch" will not prevent theft I suspect.