The ostensibly principled position these folks are taking is that they want smaller government. They want government to do less. And just because so many of them are retired Medicare and Social Security recipients who get to their protests in national parks via public mass transit, don‘t let that get in the way of their anti-government message.
When you are shown to demonstrably not believe something you say you believe, that‘s hypocrisy. And reasonably speaking, it should undermine your claim that you‘re acting on principle. You can‘t say you hate government-run health care, for example, and then profess your love for Medicare. It is one or the other. Or you don‘t make any sense.