a tale of two headlines

On Google News at the moment are these two headlines, both from Reuters:

Arab leaders urge Israel, world to take peace offer Reuters Canada

Abbas warns of violence if “hand of peace” rejected
Reuters AlertNet 

If you follow the links, they tell essentially the same story—indeed, they are the same story—but they are told differently, starting from the first paragraph.

The Reuters Canada version starts on a positive note, with Arab leaders “urging” (a verb that carries the connotation of reasonableness):

RIYADH (Reuters) - Arab leaders urged world powers on Thursday to use an Arab peace plan to relaunch efforts to end the Arab-Israeli conflict, and the Palestinian president warned of more violence if the “hand of peace” was rejected.

Speaking on the final day of an Arab summit in Riyadh, Mahmoud Abbas called on Israel not waste the chance for peace, and called for a committee led by Saudi Arabia to pursue it.

“I reiterate the sincerity of the Palestinian will in extending the hand of peace to the Israeli people … We should not waste more chances in the history of this long and painful cause,” he told the closing ceremony.

“The entire region will be under renewed threats of war, explosions, as well as regional and international confrontations, as a result of the absence of a solution or the impossibility of implementing one,” Abbas added.

The Reuters AlertNet version starts rather differently—with a “warning” (i.e., a threat):

RIYADH, March 29 (Reuters) - Palestinian President Mahmoud Abbas warned on Thursday of violence if Israel rejected a Palestinian “hand of peace”, and called for an international conference on achieving peace.

“I reiterate the sincerity of the Palestinian will in extending the hand of peace to the Israeli people … we should not waste more chances in the history of this long and painful cause,” he told the closing ceremony of an Arab summit. “The entire region will be under renewed threats of war, explosions, as well as regional and international confrontations, as a result of the absence of a solution or the impossibility of implementing one,” Abbas added.

What is the reason for these two versions of the same story from Reuters—one that leads with a not so subtle threat and another that communicates some optimism?

I don’t know the reason. I would like to understand it, however, because I I know that these different headlines serve the forces of chaos, misunderstanding, antagonism, and distrust rather than the truth.