Prosecuting negligent officers on duty at the ground may be very difficult but I certainly think the ones who lied in court and in statements, as well as those who doctored and altered many police and witness statements, personally and by bullying individuals should have the book thrown at them and then some. Conspiracy to pervert the course of justice I believe is the term.
Regardless of your views on Hillsborough, Liverpool fans, the findings of the panels etc if, as a society that is allowed to go unpunished, no matter the length of time since it happened then we are on a very slippery slope. The lies, deceit and intimidation simply must result in prosecution to ensure that such a dangerous precedent isnt repeated