But if a bar owner chose not to pay for security, he could effectively force the police to be his security, couldn't he?
No doubt that they are paid to protect the peace, but I don't think that necessarily extends to a duty to do it everywhere. Limerick, by choosing to have a football team playing matches, are creating the possibility of disorder. I think it is right that if Limerick want a police presence inside the ground, they should have to pay for it.
I do agree with your point that the "we don't have the resources" line suddenly disappears if they will be paid for it.