I don’t follow you. They are BOTH the capitalist party, though not equally so. Also, voting for one side vs. the other does not mean that you agree with EVERYTHING that they do - in fact it is more common these days to vote against the other side and ignore what your own might plan or actually do. Nor is it true that avoiding voting - e.g. for mental or physical health reasons - means that someone does not care at all about what happens as a result of the election. Plus, a rather ENORMOUS fraction of people in the USA could skip a particular vote and it would not make the tiniest iota of difference, due to the electoral college system, though that heavily depends on where you live, and also trends to be more true the larger the region impacted (federal > state > county), whereas local elections could turn on a dime and also make a huge impact regardless of what goes on in upper levels - e.g. federal sends monies to help people but locals turn that aid away b/c “reasons”.

Unpopular opinion alert: I dare to say that many people who should NOT be voting - especially those who do little to no research beforehand - would vastly improve the outcome of elections by NOT voting, and thereby contribute more that way than they do now, by actually voting, where they tend to just magnify the votes of whatever the TV & radio talk show people (or more recently, pastors behind the pulpit) tell them to do. The latter makes the USA even more of a plutocracy than later, when the votes get ignored and the rich get whatever they want regardless of who got elected does.