As the last 25 years' debate, accusations, coverups and so on have shown there are many factors that were instrumental in the 1989 Hillsborough disaster, but my point was that in 1934 the stadium was not equipped to cope and that at least 1 person died. Football fans were treated appallingly then and they were still being treated badly in 89. Hooliganism caused fences to be erected (but even that's a more complex debate) but fences did not cause deaths in 1934, at Burnden Park, or at Ibrox. These were caused - or at least it was a contibutory factor - by fans being packed into areas of venues that couldn't cope (paddocks, stairways, general terraced stands). A situation that was still true in 1989. Each disaster was different and 1934 wasn't a disaster as such but no fan should ever have lost his/her life at a football ground - safety should've been a major concern but until the modern era it was more about packing people in.
We could add Bradford to the debate about safety.