Like no-one was forced to go the game itself?
Failures in crowd control in the minutes before were directly causal to the crowd outside the entrances to the Leppings Lane end. The Police caused the overcrowding outside, then opened the exit gate to alleviate the problems they'd caused.
When the gate was open, fans were "forced" to use it as they didn't have much choice in the matter if they wanted to get inside the stadium. Indeed those that had decided they were better off out of it but were in the vicinity of the gate were forced to use it by the surge of people trying to use it.
Try reading some of the accounts of the survivors.
http://www.contrast.org/hillsborough/history/survivors.shtm
Sorry but rubbish, they weren't forced to use these gates, they CHOSE to use them. I don't mind people blaming the police for their lack of forethought, for making horrendous mistakes afterwards and for failing to realise it was a bad idea to leave fans to think for themselves but.... given a vast crowd infront of me to get in somewhere. I personally choose NOT to shove everyone infront of me, I would realise its too full and go back, then wait my turn in the turnstiles, or even give up.
At some stage, and Liverpool fans seem absolutely incapable of admitting this at all, the fans at the back CHOSE to push the people infront so they could also get in. They had a choice, realise it was too full, or to keep going anyway.... they chose the later and anyone that can't see that is blind.
I've been in loads of stituations with massive crowds, patiently waiting at the back and even eventually having to be turned away. Onto massively packed tube stations where if everyone at the back simply pushed, hundreds of people would be pushed onto the tracks, the insanely tight and cramped corridoors at Highbury, near the front in concerts.
At some stage in ALL these situations people choose that pushing forwards is a poor option, a dangerous option and don't do it.
The liverpool fans were responsible for the crush, the police were responsible for allowing the possibility of it happening, and for the absolute failure to quickly respond in the best way to save as many lives as possible, but the crushing came from people shoving, nothing more or less, and not a single person on that day HAD to shove anyone.
I will happily take this back if the police actually pushed people away from the slow turnstyle cues and actively shoved them through the exit gate, afaik that didn't happen.