Are GPS trackers in cars really good?

Are GPS trackers in cars good?  They -- that being the experts -- say it is, and that it should be mandatory for our own good. They say that they can be used to know if you were speeding prior to an accident.  They say it can be used to find you if you get lost.  It can be used to solve crimes.

But it also makes it so the government knows where we are at all times.  It allows companies to keep track of employees.  So it can be good, they say.  And it's true, it can, or at least has the potential, to be beneficial..

But it can also be used against you.  It can be used by your boss to say, "hey, you said you were here, but you were not here."

Students have been found guilty of keeping track of kids, when they were at home in their rooms.  Is that a good thing?

The government can use it to know how much you drive, and they have already talked about making laws to tax you per mile that you drive.  Is that good?

Bottom line: proponents of making GPS trackers in cars say it is for your own good.  Opponents of it say it is yet another effort to take away more of our liberties.