Newspaper writers too  often lean on tired, stereotypical language.
An annoyance to me is using  the word “decline” to mean “wouldn’t.” The usage will be familiar to anyone who  has read a news article about the police or politicians.
“The detective  declined comment about the allegations.”
“The governor’s aides declined  to elaborate on his remarks.”
The reporter softens the blow by using  “decline.” There is something wanly elegant suggested, as if a hack politician’s  aides told the reporter: “Sorry, old chap, but I have to decline to answer your  frightfully on-point query.”
People (except for those in P.G. Wodehouse  novels) don’t talk that way. They certainly don’t talk that way to nosy  reporters. The aides probably said “no comment,” or “are you out of your  *bleepin’* mind? I’m not answering that!”
These people are refusing our  requests. They are turning down reporter’s questions. They don’t want to tell  readers what’s going on. Don’t allow them to hide behind the fussy “decline.”  Tell it like it is:
“The detective wouldn’t comment on the  allegation.”
“The governor’s aides wouldn't elaborate.”
When I  first wrote up this gripe, I suggested "refuse" as a word editors could  substitute for "decline." After chats with peers and much deep meditation, I  retract that suggestion. "Refuse" has a negative, forceful connotation that we  can't be sure of most of the time.
If you are certain the source refused  to comment (let's say, in the *bleepin’* way I imagined above), go ahead and say  that. But as editors, we seldom know such context. "Wouldn't" is value-neutral  and still more straightforward than "decline."