"You can't vote for who actually represents you! You have to vote for your oppressor because if you don't they will make me suffer! So, throw yourself under the bus to protect my comfort because I refuse to have solidarity with those who are currently oppressed by the status quo."

The establishment party you keep trying to force people to vote for are already sacrificing the weak and vulnerable to maintain the system of capitalist-imperialist oppression. The party is the one sacrificing them by refusing to meet the demands of the people they are supposed to be representing.

The only (legal) leverage over the ruling class the people have is their vote for who to put in power. If you prove to always give them power regardless of if they meet the obligations of their representative position then you have thus abandoned any leverage you had to incentivize them to change.

The system is a broken one that is set up to ensure that the ruling oligarchy can continually oppress the working class so long as they threaten the middle with a "greater evil". And it will continue as is until people stop letting perfect be the enemy of good by waiting for the perfect time to change their habits and actually vote for someone who truly represents them instead of continuing to abdicate all their political autonomy into the hands of the lesser evil.