What's irritating me today

Especially in business, why is it people won't send you a short email (or leave you a brief message) giving you "the bad news?"
Yes, everyone is busy, and if you don't hear anything within a fairly short time-frame, the topline ("thanks, but, no thanks") is understood, but...
...are we really so busy we cannot give an equally minimalist response to the follow-up ("why?")?
(That's the only reason I can think of for this behavior -- avoiding having to share the "why.")
If you engage in the dance, have the courtesy of closing that loop, in a timely manner, whether you've decided it's a favorable partnership or not.
That is all.