You asked for examples of direct action earlier - this is it bud.
Dissenting to a party that refuses to take meaningful action against threats to 'any survivable society' is the bare-minimum action you could possibly take. Voting is the one tool that is given to you by a liberal democratic system to voice support or opposition, and if you're unwilling to use that tool to pursue necessary action, then i'm really not sure there are any actions you would find more agreeable to your strikingly liberal disposition.
A worker's union exercises power by threat of a worker's strike, a leftist coalition exercises power -in part- by threat of withholding support. You wouldn't blame a worker's union of being in favor of layoffs for going on strike to win concessions, at least not unless you're a boot-licking capitalist.