I don't blame you for being mislead. I've heard it repeated many times that O'Connor did it for the RC sexual abuse. And it was all incorrect. She stated at length why she ripped up the picture the next day in an interview. And she repeated that same reason in other interviews.
She said all of the main ills of Irish society (including things like alcoholism and domestic abuse) is caused by child abuse (which she says she was a daily victim at the hands of her mother). And this was caused by the English invasion of Ireland, splitting up families, repressing their language, culture, beliefs and not allowing them to teach their own children. And also exasperating the Great Potato Famine. And that the Pope permission for the invasion, knowing the English used starvation as a method for control.
The RC sexual abuse explicitly was not her reason. I mean you could throw it in there along with alcoholism and domestic violence, but that's beside the point. People tend to believe what that want to. I'm not Catholic, but untruths really bug me.
It's all in video if you need proof. It's kinda sad too that the beginning of the video has a text crawl that says she was protesting the RC sex abuse, but to anyone who listens to her she makes clear the reason was that the Pope gave permission to take over Ireland.