I think that "the rash of ISK posts" is probably due to the high number of the PPRuNe members that have been made redundant against their will are based at ISK. And some bloody good, experienced and intelligent guys and girls at ISK have been given the Royal Order of the Boot - seeing some of them get their letter was a huge shock!!
As Duncs said, there is nothing stopping others from elsewhere posting their feelings and thoughts.
MFC