Just one more thing on this, although it's probably the wrong thread, but it's reminded me.
Back then, jibbing in, or using fake tickets, was seen as a victimless crime. Kind of sticking 2 fingers up at authority and with nobody losing out, similar to what happened at music festivals. In one of the ends of the ground, maybe there would be 10000 tickets available, but everyone always felt there was room for 1 more. Sometimes a lot of 'one more's. Thats why it was so acceptable to sneak in back then and why every team did it. It wasn't Liverpool's fault, this was the norm, and it could have been any of us, which should have made it hit home with rival fans and stop any of the sick abuse happening.
That said. On to today. Now we have games where fake tickets get used. Some at the Champions League, some at the Euros. However, now with all seater stadia, using these tickets can prevent people who bought the legitimate tickets from getting in. It's shitty and it makes things worse for fellow fans who can end up missing out because of it.