Senior citizens are the most reliable voters. You mess with their health care, and you're going to have all the grannys and old coots coming after you with pitchforks (I just like that imagery). A politician will defund Medicare at their peril, and will likely be looking for a new job next election. Or earlier if there's recalls.
The politicians address that issue by simply stating that nothing will change for "current" seniors and those near retirement. Younger people are only concerned about immediate gratification and not programs for support in the distant future, that is, until they are older themselves, and find it's too late and that they are screwed.
Even on this forum, I've read many comments from members a long way from FRA that state that they don't factor in SS in their projections and will consider it a bonus if they actually get something. Those people aren't going to fight (or vote) nearly as hard to keep it as seniors and those who are much closer to receiving it. So you just have to exclude them from the changes.
BUT: SS =/= Medicare
End of life medical care is EXPENSIVE.
Right. And there have been a lot of discussions on this board where younger members (IMO) dramatically underestimate the costs associated with healthcare and aging that they are likely to incur. Young people feel fairly bulletproof (I certainly did, despite being born with a chronic endocrine condition) and usually have only vague ideas of how costs associated with aging are paid for, until they are forced to deal PERSONALLY with their own grandparents or parents needing care.
Also, plenty of younger people mistakenly assume that Medicare = 1) free healthcare; 2) Medicare covers long term care or in home care, dental work, etc. If you are lucky, you learn better via grandparents when you are still in your 20s or 30s. If you don't learn until you deal with your own parents, you could be in your 40s or 50s before you are forced to face the realities of those costs and start worrying about how you will manage them.
By that time, it might be too late for your vote on those programs to matter as much.