Growing up in Dublin there was an extreme anti Dublin sentiment from the Garda Siochana. Countless times I witnessed and was on the recieving end of a heavy flashlight, punch in the head or kick to the stomach followed by the usual "little jackine cnut" or "Dublin scum". These assaults were on children under the age of 16. When we got older they fecking knew better then to raise a hand to you.
But from my reading of this incident I don't see how racism can be involved. Is it in the police force, not surprised if it is, but it is not institutionalized like over here in the US and it certainly wouldnt be tolerated if it was.
Locals in the area have also said the guy was a dangerous scumbag and when the people in the communities around Dublin say a certain person is dangerous and trouble, believe them. For decades they have tolerated dickheads from thieving gear heads that wouldn't hurt a fly to dangerous teetotalers that just want to put the hurt on people. If Sheila and Una up the road with 11 kids between them speak up listen because they know more about what's going on than the Guards or local counselors.