Okay, but like I asked, when do you turn your back on that and work toward something else? When do you say to yourself “it doesn’t matter which of these two are better by whatever metric, I won’t stand by and assent to either of them”?
Surely some action by the Biden administration is far enough beyond the pale to make you look for a different option, right?
Even if you took a purely utilitarian approach, at some point both major parties are so far beyond what you consider acceptable that the effect of a third party vote cast with full knowledge that party won’t win is of greater utility than some poison compromise.