My radical take on BH is that Bojack isn't toxic or malevolent, but just extremely stupid because he's never had any good influences in his life so he just simply does not know how to appropriately react to situations. So all his stupid decisions end up fucking up himself and everyone around him.

This makes Todd and Mr. Peanutbutter kind of interesting contrasts, both are also pretty stupid but Todd is a Karma Houdini who seems to always end up where he started while Mr. P's fuck ups usually end up having positive influences on the people around him