I tend to agree with that, but there's a big difference between asking for help and purchasing C4.
I think you're leaving out the human agency in all of this. Someone makes a choice to "out" a poster trying to gain some privacy. If nobody chooses to do so, then that person's privacy, or at least the comfort that comes from feeling a sense of privacy, can continue.
Again, you are making the argument that people should not post private information on the Internet, and as I have said before, I understand that.
People do, however, post private information on the Internet, and I have to start there. They are asking those on the boards to respect the privacy of their identity, even if they are sharing private details of their lives.
My argument is that when someone does choose to do this, and attempts to keep their identity private, it would be nice if people made a choice to respect their attempts to distance their real identity from the content under discussion.
I know, I know, it's a rough Internet out there, but why not try to make it a little nicer?