> A popular initiative being sacrosanct and inviolable absent a second initiative seems wrong to me. Why does a populist law get to stand more firm than one passed by the elected representatives of the people?

I expect you know the answer to this. Just look at what happened with the restoration of voting rights to felons in Florida: https://en.wikipedia.org/wiki/Felony_disenfranchisement_in_F...

65% of Floridian voters chose to restore voting rights to felons; the Florida legislature chose to add additional restrictions to that restoration that were not in the original proposition, effectively preventing the restoration that Floridians had chosen.