I don’t know why paedophilia (as an urge) should be treated differently from any other tendency towards intolerable behaviour.
According to our current standards, if the threat of imprisonment or other punishment is enough to deter the behaviour, then it is indeed considered appropriate. But if psychiatric assessment of the perpetrator convinces the court that the compulsion is so strong as to be undeterred by such threats, then involuntary treatment and indefinite “non-punitive” confinement are considered an acceptable alternative.
And the question of pre-emptive identification and treatment is also much more widely relevant.
Sources: If paedophilia is a compulsion, is imprisonment the solution? | Aeon Essays
and Linking crime and genetics need not be an act of eugenics |Aeon Essays