I’d be tempted to make it a question, and ask something like “what do you think the impacts of this on [me/person] are?”.
It might be that question would already do work by getting them to think about the thing they haven’t been thinking about. But it could also elicit a defence like “it doesn’t matter because the mission is more important” in which case I’d follow up with an argument that it’s likely worth at least understanding the impacts because it might help to find actions which are better on those grounds while being comparably good—or even better—for the mission. Or it might elicit a mistaken model of the impacts, in which case I’d follow up by saying that I thought it was mistaken and explaining how.
I’d be tempted to make it a question, and ask something like “what do you think the impacts of this on [me/person] are?”.
It might be that question would already do work by getting them to think about the thing they haven’t been thinking about. But it could also elicit a defence like “it doesn’t matter because the mission is more important” in which case I’d follow up with an argument that it’s likely worth at least understanding the impacts because it might help to find actions which are better on those grounds while being comparably good—or even better—for the mission. Or it might elicit a mistaken model of the impacts, in which case I’d follow up by saying that I thought it was mistaken and explaining how.