Because it is removing what is now perceived as a freebie “right” by people who believe that government is the source of rights.
As Dennis Prager has pointed out, you can go to rehab for heroin, alcohol, tobacco, gambling, or almost any other form of addition.
But there is no rehab for what becomes perceived as a “right” and into which people believe they worked themselves into dependency.
Bingo!
But it was an across the board right that was hated until it was in jeopardy of being taken away.