If you were given a button that will erase all existence, totality of all that exists; would you be under a moral obligation to press it?

I think so. Suffering is worse than pleasure is good. Natural selection, therefore life, necessitate that countless creatures must suffer unimaginable agony for vast lengths of times to produce evolved species. By definition, this means "unfit" creatures must die, almost certainly painfully.

Look at what we are doing to farm animals. I haven't the shred of doubt that a cow is just as capable of suffering physical agony as a human being.

So yea, I think there is an undeniable moral imperative to rectify the the most grotesque mistake ever made, and erase the universe.

BTW, I still eat meat and I love life. This is just a cognitively dissonant realization that I had. I probably wouldn't press the button until I was old, and perhaps I would leave it to my children if I had any. But I think I would be committing enormous evil by delaying the erasure of the universe.