That's conflating two issues - UBS was setting their own number in their own interest. Hayes was bribing people at other banks to manipulate the rate. Both are bad, but Hayes was in another class of bad.
"The document [that Hayes points to] instructs Libor submitters to clear their judgements on the rate with certain named traders. Defence lawyer Neil Hawes last week suggested the traders held derivatives positions dependent on Libor."
http://www.risk.net/operational-risk-and-regulation/news/241...