I don't know if it is large organizations in general, more specifically it seems to be the N.Y.C. media. They are so stuck in their hidebound style guides and r

I don't know if it is large organizations in general, more specifically it seems to be the N.Y.C. media. They are so stuck in their hidebound style guides and rules that they apply them even when they are wrong. N.Y.C. itself is another of their rules: put the dots in anything that seems like it might be an acronym or initialism, even when when the rest of the world stopped using the dots decades ago. When was the last time you saw NYC spelled as N.Y.C. anywhere, except for the N.Y.C. media? These organizations will always write I.B.M., F.B.I., C.I.A., H.P., and so forth, even when those companies and organizations themselves do not use the dots in their official names. What I can't answer, though, is your question: why do they insist on this even when it contradicts the correct usage?