The recidivist paedophile John McClean will be sentenced tomorrow for sexually abusing 22 boys at Dublin's Terenure College over three decades from the 1970s to the 1990s.
The former teacher and rugby coach has admitted sexually abusing 22 boys and was described in court today as "a premeditated predator".
He is already serving an eight year sentence for the abuse of 23 other boys at the college.
McClean hid his face from his victims today as one of them faced him, reminded him of his "poison" and criticised the college authorities for "facilitating the abuse".
One of his victims Paul Kennedy, waived his anonymity and accused the other teachers and adults at the College of also offending "by not speaking up."
He described Terenure College as "a safe place for paedophiles"
McClean's crimes and the impact on his victims were outlined in court today, five of them were present and delivered victim impact statements and one joined by video link from the US.
The predatory paedophile who was form master for the first years, also taught English and French and was a rugby coach at the school.
The 78-year-old patrolled the corridors looking for victims.
He targeted "messers", children who were being bullied, the vulnerable and those who found it difficult to settle in.
McClean brought boys aged 12 to 17 to various offices and changing rooms to indecently assault and sexually abuse them.
He told them he needed to treat their sports injuries or check their development.
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McClean wore a gown which he used to cover the sexual abuse of one child during a lesson in class.
He was, as one victim said, "not the teacher to question or argue with".
Two of the victims said they were targeted when their fathers became ill, one had cancer and McClean would express concern, offer sympathy and support but then abuse them.
Victims hid from McClean in the church and the concert hall and locked themselves in the toilet to get away from them. Others mitched in parks and in town or left the school altogether.
The victims also criticised the authorities at Terenure College for "facilitating" the abuse.
Everybody knew what was going on but did nothing, one said.
Another said the other adults and teachers at the college also offended "by not speaking up".
One victim today told McClean that he was a "monster who hurt children for his own sickness but now he was "a sick old man with no future".
"May you rot in hell for eternity," he told him.
Some of victims today thanked their fellow victim Damien Hetherington who waived his anonymity and spoke out the first time McClean was convicted.
Seeing and hearing him, they said, gave them the courage and strength to come forward.
Judge Martin Nolan said today that victims could waive their anonymity if they wish and one 60-year-old man, Paul Kennedy, who was abused by McClean as a child decided to speak out.
The court heard that Mc Clean has apologised for what he has done and wishes to state that the fault is entirely his.
He says he is deeply ashamed and apologises to parents, the college, the community and staff for the damage he has done.
His defence counsel Sean Guerin says he cannot change the past, he can only express regret.
"He's an old man with a history of Addison's disease, an aggressive form of cancer and the case has attracted an awful lot of attention," he said
The judge said he will sentence McClean tomorrow.
