You're wrong about the "only unvaccinated people get sick" idea - as I noted in my previous post. You need to look into the phenomenon of "herd immunity". There's a critical mass point necessary for immunity to function for the whole population. Below that point, even those who are vaccinated can be infected. Although the course of the disease is usually less severe, it can still have negative consequences.
I had a recent bout with whooping cough, because the modern immunization throws that in with the tetanus - which is good for ten years - but immunity for the pertussis declines in around 4-5. I was approaching 10 years and it nailed me. I was never likely to die of it but I was a very unhappy camper for 6 weeks. My internist told me there is a "mini-epidemic" of pertussis among adults for this reason. So now it will be Tdap booster every 5 years or so, which is not a bad idea for me anyway since I spend so much time around horses and dogs.
“The laying of taxes is the power, and the general welfare the purpose for which the power is to be exercised. They [Congress] are not to lay taxes ad libitum for any purpose they please; but only to pay the debts or provide for the welfare of the Union. In like manner, they are not to do anything they please to provide for the general welfare, but only to lay taxes for that purpose.” Thomas Jefferson
Chief Justice John Marshall described the limits of the Welfare Clause in Gibbons v. Ogden in 1824. "Congress is authorized to lay and collect taxes, &c. to pay the debts and provide for the common defence and general welfare of the United States. ... Congress is not empowered to tax for those purposes which are within the exclusive province of the States."
Continued abbuse of the General Welfare clause could well end up with Obamacare. If you think those abuses of the clause are justified our Republic is truly at the close of it’s “great experiment”.