People can be fixed. But that doesn't mean that people will still be comfortable with them heading up their ideological non-profit, or that it's unreasonable to question whether or not he is fixed.
And even if he is fixed on the matter of his views on pedophilia, we still have all his creepy behavior toward women to contend with.
The social contract is you try to fix yourself up, society looks the other way on your old acts.
Of course, on some crimes it makes sense to put some limits directly for directly related stuff. E.g. not employing ex-child-rapists in schools.
But shunning people for their opinion, not even what they acted on, in an unrelated field... What's the incentive in getting in line with the society then?
And even if he is fixed on the matter of his views on pedophilia, we still have all his creepy behavior toward women to contend with.