While it may not be a logical proof, most folks understand when the mobster comes into the store and remarks what a shame it would be if it burned down, but that he'd be happy to ensure it doesn't for a modest fee, that he's making a threat.
@ned states he perceives this as a threat. If my wife told me that if I stayed home tonite she wouldn't sleep with the neighbor, I'd take that as a threat.
I appreciate your forthright and informative elucidation on the matter.
Edit: just for giggles I considered the post regarding the fallacy mentioned. In fact, it does not accurately reflect the matter under discussion. The statements in question take the format 'if X then not Z', and this is different than denying the antecedent. Not gonna nitpick, because what either of us think isn't really relevant, since you're committed to your statement, and @ned is to his course of powering down. Nothing I say will change either of those matters. The implied threat isn't a promise to undertake Z if not X, but leaving on the table a threat Z might happen if not X.