I don't know that it was a good idea having Rosie Batty Australian of the Year, and certainly I have sometimes found her hard to "read" in the few TV appearances on which I have seen her. But then, so did the public with Lindy Chamberlain, and she paid for that with an unwarranted jail term. Following that terrible incident, I would have thought that sensible people should take the lesson that, for people who have gone through the horror of a child lost through murder or violence, it never pays to think you understand them from a handful of media appearances.
Having said that, it is clear that she drives some on the Right absolutely nuts.
I cannot see the offensiveness of the on-line survey she promoted for Father's Day. What I can see is the repetition of offensive, defamatory and ill founded slurring of the woman that has been commonplace at that blog since her son's death.