Yes, it is sick DtD. Almost as sick as leaving your kids alone, having one disappear (however it happens) and then mounting an international media campaign with world tours and million-pound fundraising off the back of your negligence.
The thread is also, however, funny, and doesn't actually harm anyone. Which can't be said for the McCann's actions (whether or not they did more than "just" leave the kids alone).
God I hope not, Sixty! We usually (attempt) to engage brain before typing.
My advice to your offended soul is to register a protest. The ideal protest would be to resign your membership of ARRSE. I understand that this can be achieved by not logging in again, (but being Int Corps, I may be wrong)