I'm pretty sure they have police in Glasgow.
They do have police.
However, the police do not consider it their business to get involved in anything to do with local fans misbehaving.
They do, however, do everything to get involved when outsiders are doing little or nothing wrong.
Last time Aberdeen played at Ibrox, there was the customary pre-match skirkish around the undergound station. Nothing much of note, but the police go piling in to separate the two sides.
All fair enough.
Once the Aberdeen fans are surrounded and being contained, Rangers fans start throwing bottles and stuff at the penned-in Aberdeen fans.
Now, do you think it is the bottle-throwing huns that are the problem here or the Aberdeen fans who query why the police aren't doing anything to stop it happening?
Judging by the number of arrests made, it was outrageous that the Aberdeen fans didn't take having stuff thrown at them with good humour.