I see no substantial evidence of Physchim62 "blowing up" over the case, though obviously he disagrees strongly with the arbitration committee's involvement and its manner of resolving the dispute, and puts his misfortunes down to the influence of cabals.
In some ways, without actually leaving, his jeremiad resembles the kind of thing we sometimes see in a "Goodbye". The most famous of such "more in sorrow than in anger" litanies was Radiant!'s much-copied farewell of early February. 2006:
http://en.wikipedia.org/w/index.php?title=User:Radiant%21&oldid=48400694
On the meatball wiki, the GoodBye page gives a reasonable explanation of why this kind of fist-shaking is so common in online communities and why it is so often associated with the temporary departure of a fairly prominent member who feels that he is under-appreciated.
http://www.usemod.com/cgi-bin/mb.pl?GoodBye
Most of us come and go quietly, but those comings and goings are not so noticeable.
I don't believe the phenomenon of the noisy departure is a symptom of an ailing community.
I suggest that the best we can do in response is to make sure that all members of the community feel appreciated, even when (or perhaps especially when) their opinions and actions don't command complete accord.
And those members who do want to leave should be permitted to do so with dignity, and feeling that they'll be welcome to return whenever they want to. I do find it remarkable that so many valued editors who have left us at one time or another, somtimes marking their departure with doom-laden words like those of Radiant, or even copied from his, have eventually returned and resumed their much-valued work.