The US could have a motivation of simply destabilizing the region further. We seem to be good at that...
Swiss Scientists Confirm Arafat Murdered by Polonium
by RICHARD SILVERSTEIN on NOVEMBER 7, 2013
Haaretz journalist, Danny Rubinstein, who wrote an earlier book about Arafat, spent many hours interviewing Israelis officials. He says that
they were obsessed with destroying Arafat’s political credibility and ultimately getting rid of him:
In the weeks and months before Arafat’s death, he [Rubinstein] said, people in Sharon’s inner circle talked constantly about how to get rid of him. “For me, it was very clear from the beginning. Every day this was the topic – should we expel him, or kill him, or bomb the Muqata [Arafat's HQ]. It was obvious to me that they would find a way.”
In September, 2003, Israeli vice-premier Ehud Olmert had told Israel Radio virtually the same thing, that murder was definitely under consideration:
“Killing [him] is definitely one of the options.”
Even as unlikely a source as Jeffrey Goldberg provides supporting evidence confirming Sharon’s enthusiasm for offing Arafat:
[Those in] the Israeli government [who deny Israeli leaders wanted to kill Arafat] should remember that it was the official policy of several past Israeli leaders to try to kill Arafat…I had several conversations on the subject of assassinating Arafat with his principal Israeli nemesis, Ariel Sharon, and today’s report sent me back to a profile I wrote of Sharon that appeared 12 years ago:
“…By Arafat’s own count, Sharon has tried to have him killed thirteen times.
Sharon wouldn’t fix on a number, but he said the opportunity had arisen repeatedly. ‘All the governments of Israel for many years, Labor, Likud, all of them, made an effort — and I want to use a subtle word for the American reader — to remove him from our society. We never succeeded.’”
- Swiss Scientists Confirm Arafat Murdered by Polonium Tikun-Olam Tikun Olam-תיקון עולם