You should learn from people's behavior, both good and bad, rather than idolize people. Oda's clearly a flawed person, like most people.
Love isn't simple.
It's not easy to stop loving someone even when they've done something horrible, especially if you think they want to change.
It's sad to see Oda say this. I hope he's not trying to downplay the nature of the crime that happened, but, wanting to see his friend change after doing fucked up shit.
Any content made by sexually exploiting children is horrific, and should be condemned. Including a lot of stuff in live-action that's legal in a lot of places.