Flip flopping implies indecision regardless of validity of fact and switching without good reason. If there is good reason to switch, then it is simply making an informed decision. People who don’t change their stance when presented with convincing evidence to the contrary are cultists.
The sad part is that I would hesitate to even call it a social program either - it’s the bare fucking minimum. It’s just taking the money that you paid into it and paying it back out to you later in life. It provides some financial structure and stability to those who otherwise would not have it, and that’s important, sure. But considering that this is height of our vital government social programs, then the bar is already so pathetically low. This is fighting to keep the scraps when private industry is already milking us for healthcare, education, public transit, utilities, etc, etc, etc, and it’s pitiful that we have to fight to even keep this.