Question: What was the downside for the remaining sons of Feanor to recant their oath?

Up until the very end Maehdros and Maglor, who were surely aware of, and tortured by how toxic that oath had become, refused to recant it. What was preventing them from acknowledging that it had been a mistake, or even that if it had made some sense at the time of swearing, events had changed so that keeping the oath was a greater evil than abandoning it. I know there are references to “the power of oaths” but how did that power manifest? What bad thing(s) would have happened if Maehdros and Maglor simply gave up on it and tried to rejoin civil society?