Even if it was Justin Bieber? Instead of "One small step for the man...", we'd have Justin singing "baby, baby, baby..." to promote his latest album.

I think the image that is being tarnished here is yours... Imagine we aren't told who the astronauts are until a long time after the mission (the photos and video have their faces redacted or something) would the revelation that one of them was Mr Bieber really make it suddenly less of an achievement or 'tarnish' it?

I'd rather it not be Justin Bieber.

Either the rocket would blow up on the pad or it would never come back. ;)