I have to disagree with you here, kev.
@rabby has already distinguished Heysel because of the associated criminal intent to cause harm that led to the deaths, unlike Valley Parade, Ibrox or Burnden Park where the extent of the culpability was, in all likelihood, negligence (although I know there's some debate about Bradford's chairman at the time). That places it in an entirely different category, which should be reflected in the mood music coming from Liverpool.
There may be some truth in the criticism being more barbed towards Liverpool than it would be towards Forest, for example, but that is in no small part down to the dichotomy between Liverpool's predilection for pontificating about history and their reticence on this particular subject.