The reason UEFA are at fault is that they are supposed to assess the risks and then put in place a plan which is safe for supporters turning up with genuine tickets for the match.
If they were aware that there were likely to be a lot of fake tickets (and I believe Merseyside police warned them), then they have a responsibility to the other fans to make sure they can deal with that effectively.
The coverage in the Guardian has been particularly red-tinted, but there was a good interactive showing the whole route for fans to the stadium. They were essentially forced into very long bottle necks (and these couldn't be seen by the people arriving so they didn't realise that there was a problem ahead), and at these points they tried to check tickets. Even without fake tickets it looked like a recipe for disaster, but as soon as tickets start getting rejected, the whole thing collapses. There is already a crush behind, so nowhere for the fan whose ticket has been rejected to go (and bear in mind they could have a genuine ticket but a fake copy had been scanned), and given that it's a massive bottle neck, there is constant pressure building up behind.
No-one is saying that UEFA didn't look after the fans trying to jib in, they're saying that they put the fans who had spent a lot of money on genuine tickets at risk
