The reason chips for anything are coming up as an option in the first place is people don't want to take responsibility for their actions anymore. Why keep track of your kid and be a caring parent when you can just put a chip in him/her and say, "oh, well he's over there, he's probably fine." Why care about your parents when they get old if you can put a chip in them and say, "well, they're not outside, they're probably fine." For that matter, if you want to go that route, why should you even be the one keeping track of the person who has the chip implanted in them? Surely the government would be happy to waste tax dollars it takes from you to watch those poor, helpless people for you, since you can't be concerned with things such as being responsible for those you claim to care about. After all, putting our security in the hands of total strangers in our government makes so much sense.</sarcasm>
Yeah chips could prove useful in instances where kids get kidnapped, sex offenders live in the area, etc. but so what? If you live in an area where your kid might get kidnapped, keep an eye on 'em. At an amusement park or something? Hold their hands. My parents didn't have any trouble keeping track of me and I didn't have a stupid microchip in me. Neither did thousands of other kids. As far as elderly people go, sure nursing homes cost money, but if you can't afford one, even if you don't want it to be, isn't it your responsibility to take care of them, chip or not?