I'm glad you know your feelings are overexagerated.
You don't know it was out of no where, you're just presuming- what if one of them made him jump, or made the first move. What if it wasn't even him, he's just got the blame, or she was eating something nice one of the others wanted and there was no malice at all, just some over enthusiasm. You don't know and you can't know, unfortunately. However, if they were not securely bonded and were still bonding, then they should never have been left alone, and if they were still bonding and if they had supervision, then this would never have happened. Equally, if they were bonded and it was secure and this happened, it's just one of those things that happens sometimes in bonded groups or pairs.
I think your attitude towards him is overly harsh and unfair- he is a rabbit, and he will be confused and scared and lonely. I understand your frustration at the situation, but aiming it at him, who will have just done the best he could in the situation he found himself in, shows a real lack of empathy for him or understanding of rabbits in general. If you genuinely can't get over this, then do please rehome him to someone who can accept him for who he is, where he will get the love he deserves. If you can move past this then you're going to need to think carefully about how you view your rabbits and your expectations of them and acceptance levels of them- they are rabbits, not people. The only one who needs to change, is you, not him.
I'm sorry if this sounds harsh, but my heart breaks for him, because he's just being a bunny, and you're making a shed load of assumptions and judgements about the situation. I do hope Peggy comes home and recovers ok, and that things settle down for you all.
(I'm not normally this harsh, so for whatever reason this has touched 'stuff' in me, and I suspect that's former RSPCA stuff, but I do think my points are valid).