Then work to change it. Your voting system is broken and makes millions feel disenfranchised. People should be able to vote their conscience without worrying about stupid political games.
I’ve criticized then for their voting behavior as well - that if they want outcomes aligned to their values that dictates a particular voting strategy.
But you don’t get to blame them for the outcome. That’s on the broken system, and the failure of the losing party to appeal to them.
It’s not surprising that people don’t show up to vote if they don’t believe they have a voice. Provide proper representation for them rather than the slightly different shades of purple on offer now. Allow them to voice the nuance of their positions and you’d probably have Kamala as the president elect right now.
This is just the trolley problem - you’re trying to force them to pull a lever when many people feel that the only moral choice is not to.
Give them a way to participate and they’ll be able to weigh the options.