As forgiveness is an emotive subject, which most people here will say is not necessary, I will give the other opinion to balance this issue and say that for 'some', not 'all' - it may be something to be considered for healing.
And people IMO should not say it is absolutely in every case is 'not' necessary. That is like saying your opinion and your own experiences are the only ones worth considering.
But, I clarify, it should not be something anyone needs to feel obliged to do, or pushed into doing, or because someone - whether that be therapist, parent, friend, pastor or anyone - told you to do it. It is not an obligation in any way.
Also, I clarify, forgiveness does not have to be about religion. It is not only for religious people. But some people will jump to it being a 'religious only issue' to dismiss it and boost their argument against it.
If considering forgiveness - it is healthy to see it as being 'for the sufferer' to let go and move on and 'nothing to do with the abuser'. For some, it can be a very freeing and liberating experience.
I don't believe people 'have' to do it, or are failing if they don't, but I don't think everyone should be pushed into thinking it isn't possible 'at all', as for some 'it is'.
It is a very personal choice which shouldn't be pushed either way IMO.
People shouldnt be made to feel bad for wanting to forgive, or feel bad for not needing/wanting to.