What possible use could the gov come up with to use your fingerprints for besides identifying you in the course of investigation. Im sorry but Im just not important enough for the govt to spend millions of dollars on to find a way to frame me for some obscure crime.
Same thing with registering guns. I fully support the right to own a gun, but where again is the harm of registering the gun? If its stolen and used in a crime of course they can try to pin it on you, but I think thats an extreme case. At the same time, you are more likely to get it back if stolen if it has been registered. The police have a better idea of where to look in a crime investigation.