How do you know there is no intelligence used to target certain individuals? The point of random searches is just that, it is a overt deterrent.
I am amazed football has never been a target for a terrorist attack in this country (that we know of) given the global profile and sheer numbers in a very small space.
on a more local level, rarely do old fashioned dust-ups take place with lunatics with their shanks!
maybe, security at football is not all that wrong, given the fine balance that needs to be trodden to keep people safe v the melts who complain about it