It's worse if you suffer from heavy menstrual bleeding, etc. "Copper IUDs are not suitable for those who have heavy menstrual bleeding or who suffer from menstrual pain. Copper IUDs more often cause heavier menstrual bleeding, menstrual pain, increased discharge, and pain in the back and abdomen."
In general, any intervention in your body isn't ideal, but if you really need it and there are no alternatives, people do what they have to do. For example, if a person has a bad infection, they need to take antibiotics, even if they don't want to (antibiotics have their own side effects that aren't always the best).