WI/Plausibility check: UVF assassinate John Paul II

WI the UVF, or some other rabidly anti-Catholic group assassinated the Pope during the Troubles. Is this remotely possible? Consequences?

They need to try before 81, because after Ali Agca is almost ASB ... and you can count that in both his visit to Ireland and Britain it will be much more protected from the norm ...
 
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