Although there were four men, probably only one of them asks this question. The question is rhetorical and emphasizes that they should not do this. It can be translated as a statement. AT: "Certainly we should not sit here until we die" (See: [[rc://en/ta/man/translate/figs-rquestion]])
The four men with leprosy are saying that the Arameans might feed them so that they can live, or they might kill them, which would be no worse since they would die anyway.