"So don't buy GM. This isn't 1960 where they had an 80% market share or whatever it was. What happened to you supporting the free market?"
I won't. But the fact that GM already equips their cars with them is just an arrow in the rhetorical quiver when the government starts pressuring the rest to equip their cars with the same capability: "What's the big deal? GM already does it, why can't you?"
"Police need warrants to get that info."
Only if they want to use the data in a court of law. And anyhoo, getting a warrant is not much of an obstacle at all any more, if it ever was at all. One of the latest NSA revelations is that the NSA would provide this data to police - but only if the police promised to pretend that they 'discovered' it by some other means.
"And at any rate, it isn't the GPS, but rather data from which cell phone towers calls and other things bounced off that is how they get people most of the time."
Triangulation is only (relatively) accurate have three towers within range. In poor cell coverage areas, this usually isn't the case. And even when you do have three towers in range, the location is not going to be anywhere near as precise as GPS coordinates that the phone records and transmits due to signal obstructions and other problems.
"What's so wrong with law enforcement using an available tool to combat crime, so long as they abide by the Constitution? Surely you want the police to catch criminals?"
Americans are the most criminalized people on earth. We're all guilty of one crime or another, although most don't even realize it. I've seen enough people whose lives were ruined (or ended) by the police in the name of "fighting crime" to conclude that the state, and not criminals, is the greater threat to life, liberty, and property for the average American.
"Congress hasn't tried to make titles of nobility"
I chose my words carefully: "expanded and abused". The government has never had an interest in making titles of nobility, just as they've had no interest in quartering troops in peoples' houses.
"all the states have a republican form of government"
This is not a power of government, and anyway is so poorly defined as to be meaningless.
"our military has never even considered staging a coup despite decades (centuries?) of answering to an incompetent political class."
Again, not a power of government. This would simply be one arm of the state acting against others. And there was certainly plenty of talk of the military seizing power during and shortly after the Revolution (one of several reasons many of the founders didn't want a standing army).