They don’t. But even assuming they did, withholding a vote is going to increase the chances of a party who want to make things worse getting into power.
Your choices are between a terrible status quo and making the situation even worse. Why are you so intent on defending the choice that makes things worse?
What happens if one person goes on strike?
They get fired.
What happens if enough people go on a strike?
The company has to cave.
There is no difference between this and a strike. Just like with striking if enough people are willing to take the risk the goal will be achieved. If not it results in a loss.
By actively opposing the activism you are ensuring the goal will not be reached. Which in the end will not even be to your benefit if you want ceasefire voters to vote for Harris.