The other methods can fail due to misuse (missing a pill or get the timing wrong) or be removed without the partners knowledge - which does happen surprisingly often.
IUDs dont fail, and certainly a guy can miss his ball heating session or stop without the partners knowledge.
They absolutely do, and it's often life threatening when it happens. It's very unlikely, but it's not absolute protection.
Never heard about an IUD failing at all so thanks for the link anyhow
"It is the most common cause of death among women during the first trimester at approximately 6-13% of the total"
IUDs greatly reduce overall risk of pregnancy. The risk is not zero, though. When IUDs do fail, and they will, they increase the risk of ectopic pregnancies. The vast majority of those are located in the uterine tubes. Those are life threatening. There is no space for the fetus in the tube, it will rupture and cause severe bleeding which can and will kill the mother if left untreated. It's an important cause of acute abdomen.
Not saying either side is the only one who ever does weird things - noting that ideally, each side would be able to make a choice and have it stick, and it would require both sides consent for a child.
But the problem we want to solve is poor control over family planning, not blaming people for making human mistakes. We do that by developing better contraception options, for both men and women.
Assumes perfect use. The real figure is lower. Condoms simply can't compete with other contraception methods. Their main purpose is prevention of sexually transmitted diseases.