Del Piero is the captain of the team, what do you want him to do or act? Stay quiet? It's his duty to make statements in these difficult moments. He shouldn't only be a captain and leader on the pitch but also off it too.
Personally, it makes a lot of difference to me and many others if Ale states how we should work hard and bounce back more than lets say Melo or Krasic. The man feels he's part of responsibility and it only makes sense to state this in this difficult moment.