In what way are you describing a healthy person? Would we call a person as being healthy if they had a problem with being aggressive, repeatedly committing assault, convicted several times, and admitting that they can't control their aggression and intentionally goes and look for people to beat up?

I think such person is likely to have a medical condition, psychological or actually brain damage, and treatment (involuntarily if needed) is best for both the individual and society. Trying to "find other ways to prevent them for coming into contact with people" would be horrible bad idea and unlikely to work.