I've not heard of any states passing laws restricting free speech, or passing any amendments to their constitutions to even make such a law possible.
And I've not claimed that they have. My reference was to a theoretical scenario. With that in mind, would you care to answer my question?
"Is not a federal intervention to prevent state restrictions of free speech actually a less tyrannical or authoritarian imposition than that state's unrestricted crackdown on free speech would have been? You need to distinguish between the relative effects of ends and means; you may consider the means of federal intervention 'tyrannical'; but in such a situation, it would ultimately prevent a more tyrannical end."
If you want to look at original intent lets, again, look at the quote by James Madison.
"The powers delegated by the proposed Constitution to the federal government are few and defined." - James Madison
The programs we are discussing are not defined in the Constitution, therefore they are not a legitimate power of the federal government. Now you claim that they couldn't have foreseen such and such, which is correct. However, they foresaw that they couldn't foresee future developments and gave us a mode of amending the Constitution to make that which is unconstitutional, constitutional. They can't simply pass a law that is not authorized by the Constitution, but they can attempt to amend the Constitution to authorize that law.
You're not making appropriate distinctions here. The option of constitutional amendment is for the incorporation of policies and rules that were previously unconsidered altogether (such as lowering the voting age, for instance). The establishment of federal welfare programs is neither opposed to the original intent of the Founding Fathers nor an addition of a new doctrine entirely unconsidered by them. As previously mentioned, they had an interest in promoting equality (or at least equity), but simply did not envision the detriment that large-scale industrialization (combined with the utilization of wage labor and the extraction of surplus value), would pose to that end. Had they been completely aware of it, they would have advocated federal welfare programs themselves. For instance, we can look to Alexander Hamilton's
Reports of the Secretary of the Treasury on the Subject of Manufactures for an illustration of the manner in which they realized that government intervention (namely through the protection of infant industries), is able to uphold economic stability.
You've also still not addressed the additional factor of there being a compelling government interest in upholding economic stability, and the role of welfare in maintaining the physical efficiency of the workforce and therefore sustaining capitalism.