Why is divorce seen as such a bad thing? Often times it's for the best for everyone involved?

It may be tough at first but atleast you have closure when it comes down to it. It is a much better alternative than staying in a shattered relationship and facing the agony of seeing that person everyday. Especially when you have kids. You are doing them a disservice by constantly berating each other infront of them. Over time making them resent you and possibly forming unhealthy relationships of their own due to constant exposure.