i know this is old,
but this campaign is bullshit.
mulesing is used to prevent blowfly strike, a disease of merino sheep which often leads to slow and painful deaths. so even when speaking from the sheep’s point of view, mulesing is the better choice.
so far, there are no commercially viable alternatives to mulesing and there’s also no other methods that are as effective.
although perhaps passing legislation forcing use of anesthetics etc. would be a good idea.