I don't want to have plastic surgery but I am not against it. If people want to have it, then let them. They say it's a sin to alter one's image or body, so is premarital sex and other things that are already widely accepted in today's society.
Yes. It's not only about the aesthetics but also, it helps people who had injuries, or should I say damaged face or whatever part of the body, to recover or to look like before the accident which also helps people on their psychological recovery.