Why does society shame plastic surgery but praise beauty?

"Society" is a conglomerate of multiple smaller societies that are local to various regions, professions or other groups. These smaller societies are made up of "micro" societies and so forth, not to mention that there are multiple societies across the world that have varying value judgements on plastic surgery and what beauty is.

Generally, depending on where a person is in this spectrum, plastic surgery is only shamed when an person is going over board in trying to appear "beautiful", i.e. having multiple surgeries to "correct" imperceivable flaws. In other cultures, however, multiple plastic surgeries are an accepted practice whilst in others they are practically unknown.

Probably because natural beauty is preferred to artificial beauty.

Did not know there was shame attached. At least not where I live.