This was the avenue I came at it from as well.
Obviously Diane is morally in the right here, I don’t think that’s up for debate…
…but if you have a moral cause and it affects your partner…
…and your partner begs you to not blow it out of proportion as it will damage what they have worked to get and where they are in life…
…and you agree with your partner and promise not to follow through publicly and not to “blow it up”…
…and then you go ahead and “blow it up” anyway…
…you are putting your crusade over the feelings and wants of your partner.
You’re still morally right, but you’re a terrible partner.
The world is absolutely FILLED with injustice, you can pick up a mantle against almost anything and be securely on the side of righteousness…but if you’re putting your partner’s wants and needs on the backburner to do so, you don’t need to be in a partnership at all.
This action showed that Diane puts her partners’ feelings second behind her own personal crusades and demonstrates another level of her and Mr. Peanutbutter’s complete incompatibility.
My two cents.
I think you need to rewatch the main episode in question…the vitriol she was receiving was one of the main reasons he wanted her to stop.
That line where he screams “THESE ARE DEATH THREATS! FOR MY WIFE!” shows a rare bout of real emotion from PB as its obvious he’s worried sick for her safety.
I don’t think he “stood by and allowed his wife to receive such vitriol” in any way, shape, or form. Quite the opposite in fact.