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We don't institutionalize/imprison people for who they *are*, but for what they *do*.
True, the only way to identify a pedophile is if they try to rape a child, it doesn’t matter what laws are passed or how they are categorized, that’s always been the case and it will always be illegal.
No matter how we treat them there is no magical way of finding them unless they admit it first (doubtful) or they strike.
We will never allow people to prey on prepubescent children in the USA or Canada whether some idiots categorizes them a certain way or not. If anyone ever did seriously try to allow groups like NAMBLA to practice legally the backlash would be incredibly severe, no matter how they tried to go about it.