"And how much collusion did the IRA murderers get from the Irish police and army in running away back over the border after their cowardly attacks?"

A fair question guest. I have heard allegations of this, but I haven't seen any hard evidence. Frankly, given the length of time the (modern) troubles have gone on, & the strength of feeling involved, I would be surprised if there were no incidents of collusion by individuals.
Evidence is what is needed though. Times, places, specific incidents, names. And of course how high in the police force it went & whether intelligence services & or politicians were complicit. If you can point me to any information about this guest, I'd be grateful.