"Australian-born Greer likened Irwin to a lion tamer and said he had intruded on the habitats of animals and treated them with “massive insensitivity.”"

I beg to differ.... I think she may be using this tragedy to promote her own agenda. It has been my experience that when people compare apples and oranges to make a point that they are either trying to grab undue spotlight or lend some shred of credibility to their own personal crusade.
'Crocodile Hunter' exploited animals, critic says