" However, why should we as a society (by this I mean pay through tax system) provide for rehabilitation of these offenders when there is no provision for rehabilitation/therapy for victims. "
I think that shocking. Especially when a small percentage of victims get caught up in a cycle of abuse. Ie. they marry a man like their father and then their children are abused. Or worst still they abuse children in the same way that they were abused.
Even a victim does not get caught in a cycle of abuse then they often suffer in other ways.
"Is the answer civil lawsuits as in US? Would 1 million compensation claims against offenders resolve annything?"
Well do the offenders have any money. There is no point sueing someone on income support.
I don't think someone can help feeling attracted to children. It becomes more of an issue when they act on their impluses. Being sexually attracted to children is a mental illness that should be helped like any other mental illness.
Obviously if someone does not control their tempations then it is necessary to lock them up.