There seems to be a misunderstanding that we don't have standing at football games in the UK. We do. There are standing areas at just about every football ground in England, bar the top two divisions. Are there disasters every week at these grounds? No, because crowds are properly managed these days. Even in the top two divisions of English football fans stand behind the goals although seating is provided.
I'd guess it's those that don't regularly go to football matches who hold their hands up in horror at the thought of fans standing at football games, whereas, in fact fans stand week in, week out across the country without any problem.