That is my biggest fear. Governments in other countries have rug pulled retirement savings accounts in the past. The US may one day think it's a good idea. I've been drawing down mine but I need at least another 3 years (trying to avoid certain tax brackets).

Wouldn't surprise me if one day those thieves say... hey we're going to replace your 401K holdings with these special government bonds that pay a guaranteed rate of x%. They're as good as cash in the pocket. We promise.