On that I agree. But attempts to modify the Social Security program is not called the "third rail of politics" by politicians for nothing. It will be even more so with private retirement savings.
Since defined pension plans have gone the way of the dodo bird (unless you work in the public sector), 401(k) and IRAs are all the people have left to supplement the meager Social Security payments. And most of them don't put nearly as much into them as they should but that's a story for another thread.
Attempts to come after 401k's will be political suicide and the outrage of the people will be truly bi-partisan. Democrats invest in 401k's too.
So I think this will be a non-starter. But yes, if the politicians could get their grubby hands on our retirement savings, they would do so.
That is my hope as well.