The conditions for most of the sorts of behavior that our moral world considers grievous and despicable will not exist in heaven: that’s why Jesus is not concerned with reforming them. There will be no advantage to murder, adultery, or financial skulduggery in heaven; the rewards of gaining control over others will not exist; attempts at intimidation and coercion will be regarded with the heavenly equivalent of bemusement. Jesus barely mentions things like that, because his concern is preparing us for a life spent under conditions entirely different from those to which we have been accustomed.
A moral monster, arriving in heaven, will be disadvantaged, not by his vile history, but by his bewilderment.