"Shmucking" someone can backfire in many cases and cause a bigger problem.
To be spiteful (I mean do we really know the mental state of the attorney writing the c and d?) maybe he would decide pro bono to file some action even knowing it might fail, on his own time, to defend his honor. Which this attorney would then have to defend pro bono.
The other thing with regard to the listed domains is as they always say "don't ask a question you don't know the answer to". They probably don't know whether the others have been approached or not. And it doesn't matter at this stage anyway. So what. Maybe he was the first one.
Lastly Kaplitt isn't known for expertise in either domain names or IP. If he was he would know that very often people with bogus claims are able to wrestle domains from people for bogus reasons.
Oh one last thing. In his letter he states that "ICANN rulings have held that..." (or something like that). ICANN doesn't issue "rulings" like that for this (.com). He is almost certainly referring to the UDRP cases not ICANN.