There’s nothing wrong with acknowledging concessions that politicians make, but that doesn’t mean we have to support them. Just keep up the pressure. Like @zikzak argues, the way that change is achieved is through mass mobilization of regular people. Politicians only make concessions when we force them to.
Conversely, sometimes a given politician might be more disposed to make concessions, so theoretically there are reasons to strategically vote for certain candidates. But in practice what this means is that we wait generations for change and things only get worse and worse, and people go to their graves still waiting. Still, liberals smugly remind us that their party of choice, widely known as the graveyard of movements, is our only option, and that we have to wait and wait and wait for positive change.
Anticapitalist radical MLK wrote in his Letter from a Birmingham Jail that white moderates are the greatest threat to freedom today because they perpetually delay serious change and so function as a stabilizing force for the status quo. I think his analysis still works for liberals today, and is particularly apt for this conversation.
Just as importantly, Cory mentions foreign wars. These and other forms of US interventions (coups, CIA ops, aid to dictators and fascists, etc.) have killed countless millions–far more than 20 million since WWII. The two dominant political parties in the US are responsible for destroying countless lives, countries, and hopes for a better world. Asking us to support the people responsible “because healthcare” is cruel and short-sighted.
We were probably all raised on the idea that when a government kills millions of people, then the world has an imperative to remove it. This is the excuse for US interventionism, and it’s bound up with the way that our societies view Hitler, for example, the poster boy for “OK we have to do something drastic about this.” If we’re going to judge a society by its atrocities then the US is quite possibly and objectively the single worst state in all the world. Revolutionary change is, in my view, imperative. But I also think that for the US it is impossible.
Frederic Jameson once wrote that, with the advent of the nuclear bomb it is now easier to imagine the end of the world than it is to imagine the end of capitalism. I think the same applies to the way things are in the US. It’s easier to imagine that society there will keep on going the same way right up to the moment of its collapse, and then everyone loses. For working-class people, the best thing I can recommend is that they get out while they can and move somewhere with a better culture and better material conditions, because life is too short to wait on Americans to stop being Americans.