No, but I can fault someone for believing that we could have gotten more just by believing in it or wanting it more or whatever the Bernie plan is.Maybe it's not a popular idea, but the United States is way behind a lot of other western countries and what's been done in the last 8 years are extremely baby steps forward in providing for our citizens the way many other modern western countries are. You cant fault someone for not being complacent and not thinking we've done everything we can, especially when we need to do so much more.
Hillary Clinton proposed single payer health care in 1993. It was and is the right thing to want. But proposing it without a path to passing it set any progress on health care back by two decades. Who knows where we'd be now if she had proposed something it the ACA (they probably had a better shot a public option then).
Sometimes baby steps actually get you there faster.