This looks like an extension of Yvain's post on offense vs. harm-minimization, with Jews replacing salmon and unchangeable Nazis replacing electrode-implanted Brits.

The consequentialist argument, in both cases, is that if a large group of people are suffering, even if that suffering is based on some weird and unreasonable-seeming aversion, then indefinitely maintaining the status quo in which that large group of people continues to suffer is not a good option. Depending how you construct your hypothetical scenario, and how eager your audience is to play along, you can rule out all of the alternative courses of action except for ones that seem wrong.