Well, sometimes people get damsels and don't look into what species they are getting. Some damsels are more aggressive as they get older. Since saltwater fish usually cost a considerable amount of money, having a damsel bully a prized fish to death is kind of dissapointing. Some damsels can exist in a communtiy setting, some can not, if they can not, then removing them is the only option because they were cheap. I think damsels are a great fish, as long as you find ones that are compatible with other fish. Its like that with any fish, just have to know what you are actually getting before you get it.