Here’s how I put it elsewhere in this thread:

You have two choices, one is to poison a towns water supply without telling them.

The other choice is poisoning the town’s water supply, not telling them, and then shooting the survivors as they flee the town.

No question that slaughtering fleeing survivors is worse. But either way, you’re being asked to sign your name to poisoning innocent people.

You can only see “you’re voting for slaughtering fleeing townspeople!” But plenty of people cannot stomach voting for poisoning the townspeople in the first place.

You’re both looking at the same situation but seeing different elements.

The nuance comes in here: both are valid stances to take. If you don’t vote “against” shooting the survivors, there’s a greater chance survivors will be shot. But voting for the people poisoning the water supply is untenable for many, and not understanding why that is, is a huge problem.