That's not really the cause. It is more like grease to ease the egress when someone already looking for the exit for other reasons needs an easy excuse. Ireland's Catholicism was already weakened by various ideological currents and social engineering that swept across the country, many facilitated by powerful, shall we say, American corporate interest and investment. Living the Catholic faith is demanding and utterly unappealing to those who've been made slaves to their deranged passions. Not so coincidentally, those who are slaves to their passions are easier to control. I leave the inference to be made here as an exercise for the reader.
The British colonization of Ireland was brutal, but it was corporeal. The spiritual colonization today, materially prosperous and comfortable, destroys the soul.
I think it's probably got something to do with it. Plenty of non-Catholic denominations and other faiths have had similar abuse scandals, and in the public consciousness the crimes of Catholic priests get filed under "why religion is bad" as much as "why Catholicism is bad".
Well, it's certainly not helping with the recruiting of younger people into that particular religion... Today's 80 year olds in the church probably joined 60-75 years ago.
There is probably not a single country where the catholic church is not the best place for child sex abusers.
Well maybe Islam, as it is having Mohammed, who raped a nine year old girl, as their "Son of God".