I think there's no point in holding grudges because at the end of the day, everyone still made their own share of mistakes.
None of us is made perfectly by the Almighty. We are all bound to commit errors, mistakes, failures, evils, however you want to name it. We can never expect a person to please us fully, but we also don't have the right to reject them for not pleasing us. We might just as well be neutral about the whole damn thing. It's always better to resolve things by letting them be since we don't have control over them anyway. Finally, It would have since been better if we all have just lived our life peacefully.
The big question would always lead to: why would we even want to have hard feelings with someone whom we can't even avoid? There is just no point. None at all. Because he/she will still be who he/she used to be and we just have to accept it. Accepting is not hard. We learned to accept our dirty little selves in the first place.
xoxo,
Jeanne
P.S.
I call for PEACE.
Let us all wave our white flags. :)