Given the size of the NHS, there are statistically likely to be a few paedophiles there. So why do people work for the NHS? The usual reasons: they like the job, they need money, they have a family to support and so on.
I don't know which organisation you're talking about, but much the same answer applies.
What puzzles me is why anyone would want to join an organisation accused of such criminality. . This is not something exclusive to Ireland such cases have been reported from all over the world. Surely if you are in disagreement with your own organisation there must be other alternatives. Unless as jno suggests it tallies with your own beliefs.
Surely not ?