Philosophy Toolkit: Objective/Subjective Claims

In the 'Objective/Subjective Claims' paragraph in the Philosophy Toolkit, 'Murder is wrong' is given as an example of an objective claim.  I am unsure whether this is the best example, as the objectivity of the claim in this case depends heavily on whether 'wrong' and 'right' (or perhaps 'good' and 'evil') are objective terms as well, a claim that seems somewhat debatable to me.  While I do not necessarily disagree with the objectivity of the claim, I think that it might be easier for some to understand the terms presented if the example was a less contentious claim.