Comment by PhasmaFelis

This particular one was probably downvoted because it's either naive or a weak joke to assume that Jobs knew or cared that it was a Watchmen reference.

A much better question would be "why was he offended by a fairly innocuous T-shirt." That's the sort of thing that might get you the side-eye from a particularly high-strung middle school teacher, but it's pretty funny to imagine someone like Jobs being so uptight.