Hillsborough is one to start with which I think that you're alluding to. The courts could look into any disaster or event from years ago with a modern approach and apportion blame to specific things that probably wouldn't have been looked at thought about or 'risk assessed' at the time.
Nothing wrong with looking at things with a modern approach, if it means identifying a cause and effect situation which wasn't identified previously then this is a good thing. However in this case it's not necessarily applied in a manner of huge magnitude, theres video footage from the time that has clearly shown where errors were made.
Looking back to the time, I think the police did what they thought was right, and, it probably was the right thing to do at that specific moment. Obviously the consequences were awful but opening the gates at the Leppings lane end probably stopped people from being crushed to death outside the ground..
They did what was right to open the gates to ease they pressure on the crowd outside the turnstiles yes but that crowd was already badly managed by the police in the first place, this has already been stated in the Lord Justice Taylor report. They opened the gate after failing to properly structure the flow of traffic. Where the BIG mistake was, was not directing fans to the more emptier pens, instead letting the crowd head to the more obvious entrance in front of them. This gate should have been closed before the turnstile gates were opened as is was already identfied these these pens were already full, the police knew this before the action was taken. Once the crush began to take effect then the front gates should have been opened, it was obvious to see on those awful photographs, not to mention the police had all the authority to delay the kick off. We then have the aftermath of the countless doctored police reports to try and apportion the blame from themselves, they even lied about a casulty having alcohol in his blood to prove that it was 'drunken idiots'. This is the kind of things the Liverpool fans are rightly angry about.
In previous FA Cup semi finals there was always police directing fans to the correct pens and locking gates when full, David Duckenfield who had no experience of being police commander at the ground made the huge error in neglecting this
You can say yeah, it was the fault of the Liverpool fans pushing their way in but its about crowd control, if hundreds of thousands of people turn up to en event there is always going to be confusion in unfamiliar surroundings, its the police's job to do this.
I still can't believe in 2016 people are still blaming the fans for this.