We've been down this road before, but I will travel down it again. You hang your hat on the common good language in Section 8, yet if you follow that to its logical conclusion, then there would be no restrictions on the power of government. Clearly, the founding fathers intended to severely limit the power of the federal government. If government can tax for anything they feel is in the common good, then there are realistically no limits on the power of the federal government. The dissenting opinion in the ACA case pointed this out. The logical interpretation of the common good language, since the founding fathers went out of their way to limit the power of government, is that the authority to tax cannot exceed the powers already granted the government in other sections. In other words, the government cannot use taxation to expand its powers beyond what is specifically granted it in the other sections of the Constitution. But that interpretation does not suite the purposes of people who want big government.No, not trying to create equal outcomes, just the equal opportunity for outcomes. That kind of comes under the equal protection clause of the 14th amendment.
Article 1, Section 8 of the Constitution clearly gives the government the power to tax people to provide for the common defense and general welfare. Providing healthcare for all certainly falls under that heading IMHO.
In my opinion, this comes back to what I said before. The Constitution is only as good as the people enforcing it. It is not difficult for people in power to appoint folks who will interpret the Constitution in a way that allows for passage of things they want to get done. Supreme court decisions have used Adam Smith's Wealth of Nations as the basis of the decision, which obviously has nothing to do with anything. FDR manipulated the court to get things passed that today is thought of as normal, but back then was thought of as unconstitutional. Unfortunately, once you open the door to the expansion of government power, it's virtually impossible to close it again.