Sometimes less is more but not always, so it would depend how it worked in an edit.
Having him already killing children (in a moment of insanity which he deeply regrets at that point) makes it easier to believe he might do it again and be more outwardly callous about it in the future (as he becomes desensitised to the horror of what he is doing).
We have no evidence that he has gone that far other than his confession.
His choice of confessor needs to change though, Palpatine makes much more sense, Padme falling in love with a self confessed child murderer makes no sense at all.
Palpatine keeping the information under his cowl does.