So we're not talking about the FBI or NSA using this to find out you have irritable bowel syndrome.
(chances are they already know from other sources like Facebook anyway...*tin foil hat*).
and they likely wouldnt care anyway (life is not a hollywood movie).
You're right. They don't care about that.
But they do care about things like prescription habits (Your receiving & your doctor's prescribing), GSWs, abortions (Did you forget Republicans are still trying to ban those?), stem cell treatments, assisted suicide, plastic surgery, and any other medical procedure they're trying to restrict or ban, or they feel indicates criminal activity (too many chemical burns? Maybe you have a meth lab).
Just because you or I can't think of a way to abuse the data now, doesn't mean the Federal Government won't figure out a way to abuse you in the future, using the data. Yes there are legitimate reasons for the Feds to have the data, but unfortunately, as has been proven over, and over, and over again, they can't be trusted.