It's my belief that humility, compassion and empathy are important in general (in society), not just when it comes to these boards and dealing with infidelity. In my 40+ years on this earth I have noticed a decline in these qualities - more of a focus on self and less on others; more of a need to be "right" or defend your point of view, than to really listen to and take in what other's have to say; more polarization.
As a person diagnosed with multiple mental illnesses, including Borderline Personality Disorder, these qualities certainly have not come easy for me. It's taken a lot of hard work and mindfulness, and there are still times where I fail in those areas and have to reflect on where I could have handled things differently, so I can do better the next time. It's an ongoing process, that's for sure.
When I respond on SI, I tend to either ask a lot of questions to encourage the OP to reflect on their situations, or, for lack of a better term, "call out" unhealthy attitudes and behaviours. I don't do well with coddling or sugar-coating and can be pretty blunt at times, and I realize that can come across as an attack to some, which is certainly not the intent. In all my years of IC I have found most of my growth and healing came from working with therapists who were willing to hold my feet to the fire and call me out on my shit, along with asking probing and reflective questions, so that is the approach I try to take here.
I actually think it's good that there is a variety of approaches, from gentle to firm, on these boards because we don't know which approach will be most effective to the OP. That said, the truly vicious attacks and projections from some BS are definitely not helpful and I cringe when I read them.
I do see a lot of defensiveness, dismissiveness, and self-righteousness from quite a few WS recently, and I think you are right that it speaks to a lack of compassion and humility. I've pondered the whys of this and I think there are many reasons - they are too new, they are too focused on saving their relationship rather than truly working on themselves, they are trying to project an image of remorsefulness to their BS who may be reading or to others on SI (i.e. seeking external validation), etc. I think the list of reasons could be quite long. Maybe it's as simple as they just don't know what the word humility means.
I know that in my situation, I'd heard the word humility before, and had a basic understanding of it, but really didn't fully understand what it really meant or how to put it into practice. So, being the curious person that I am, I read a bunch of books and articles to get a real sense of it, so I could develop it in myself. I still have my notes and was actually thinking of sharing them before you posted this, which I might still do, but I'll start a new thread instead of making this response any longer than it already is.
I really do think it's important to have more conversations on here about things like humility, compassion, empathy, vulnerability, authenticity, etc. Things that can help people psychologically transform themselves. I see far too many posts on "what can I do to save my relationship?" and very few in comparison on "how can I become psychologically healthier and grow as a person?".
Well I've rambled on enough. Thanks for posting this WOES, I think it's a good conversation to have.