I think TRP is upset about:
Claims about rape and sexual assault based on a few lines taken out-of-context. It seem likely the hospital sex incident was consensual if you listen to the whole section of the podcast. And, even if it weren't consensual, it's for the courts to decide if charges are filed. As far as I can tell, this hasn't happened in the ~year since the 2014 relationship ended (based on the archived list of "conquests"), nor since the story broke.
Out-of-hand rejection of their multiple apologies. These guys appear to have been in what /r/theredpill describes as the "anger" phase (they use the model of The Five Stages of Grief) when discussing acceptance of "the pill". Many people make terrible mistakes when angry in general, then seek forgiveness as they progress beyond. From what I've read, they both felt significantly hurt by women in their past, and from negative dating experiences in general. This is not an excuse for their words, but I understand that some TRPers can imagine themselves getting called out, and would hope that they could eventually repair any damage they've caused with their friends and community. The Waking Life guys tried to begin making amends, but I think they started too soon, while the AVL community was too upset.
An apparent sexual double-standard. I know many women that post-divorce/breakup began bad-mouthing men, and having significant amounts of casual sex as a way to reclaim their lives/sexuality. The common community response isn't to shame them, but more of a "you go, girl!" attitude. Heck, there's plenty of similar anonymous blogs by women out there, detailing both aspects (hatred and specifics of encounters); TRPers complain that no one is up in arms about those women.
Demonization of their sexual approach/success. A poster from one TRP thread (from memory, don't recall where) is that people are mad at them for "winning at Tinder". The TRP claim is that no one would "swallow the pill" if it didn't actually work. From a psychological/social aspect, there are many things TRP actually gets right about sexual dynamics and attraction (if you can weed through all the anger). Confidence, physical attractiveness (working out, fashion), lack of neediness, social/economic status improvement, owning your own happiness, etc. These are all very positive self-improvements that anyone can benefit from; the demonization stems from the fact that these are being applied by men to gain access to sex.
Satisfaction in the destruction of these mens' lives. Neither will be welcome in this community for a significant length of time, and both will have significant difficulty in any sort of future employment due to the wide-spread publicity of this story. No matter what personal transformation in attitude either has in the coming years, they will be shunned, blacklisted, and generally reduced to poverty. Combine that, with the glee expressed at the outcome by many, and the community rejection of their attempts at apology and restitution (above), these men will spend their next several years (possibly more) as social/economic outcasts. How is this humane?
Full disclosure:
I started reading /r/theredpill a few years ago, and applied many of the positive aspects to my life, while fortunately avoiding the anger. I did go through a faze of dating multiple women, but I was completely open and honest with all of them. I stopped reading the sub a long time ago, due to disgust with the vitriol towards women.
I'm currently maintaining a (hopefully) neutral recap of the events and media coverage as they transpire. If nothing else, I hope that this events can serve as a wake-up call for members of /r/theredpill to understand the damage the anger phase can cause, both to themselves, and to the women they're involved with.