is it ever ok?

Is there ever a time when acting with good intentions is optional? Is there ever a time when it's ok to hate?

I can't think of it.

Perhaps there is a time when something so terrible happens that we are driven to it... such as mass killings, abuse of children, rape, betrayal... But thank God the really terrible things in life are somewhat rare.

It's in the normal flow of life where it seems to slip in for really no good reason. It's easy to lose sense of the big picture, and let self-indulgence drive us to hate people for silly things - most of which we can, if we choose, simply rise above. Bitterness is just not worth it.