To be clear, the "BIPOC workers" and "fight against totalitarianism" are elements of picklists, with other options like "We are technologists who want pay equity". The overall message of the picklist is that the union is an inclusive group which stands together for a variety of reasons.
And, the union doesn't claim to speak for all workers. It only claims to speak for its members, and to fight to protect all workers.
This is the paradox of choice. In most cases, it doesn't pay to spend your time hemming and hawing about find the perfect project. It helps to just pick one, even if it's the stupidest idea of the lot.
The alternative is to wind up as Burdian's Ass, who is equally hungry and thirsty, can't decide whether to eat hay or drink water, and so dies of hunger and thirst.