Dissenting to a party that refuses to take meaningful action
I think this is where the whole thing breaks down for me. This just seems like a childish point of view.
Yes, the system is rigged. The rich people are in control and steering the bus towards the cliff. I agree completely with putting someone in charge who will actually apply the brakes. I just don't see how, if one guy is trying to grab the wheel and steer it towards the cliff on purpose, and one guy has been trying to do some good things but it doesn't seem like it's enough to actually avoid disaster, it's productive to sit back and say "Well they're both going off the cliff so I will not get involved."
Voting for someone isn't like a tribute you give to a ruler. It's exercising control over what is going to happen. And I don't see that voting for a candidate who isn't 100% of what you need to see is in any way mutually exclusive with working for the level of change that will actually be required (whether in primaries, direct action, organizing better candidates for future elections, etc).
It's like you're sitting back and saying "well I will not help things get better until you do all the work for me and put someone on my plate who I will perfectly support and then I'll show up and vote for him."