Rachel Corrie was accidentally killed by the IDF in 2001, yet her name has been widely commemorated, there's a play based on her letters, and she has become an icon of the non-Arab anti-Israeli forces. Arrigoni was purposefully abducted, beaten and hanged, so he should rightfully be canonized even more. I doubt this will happen, but who knows. We'll wait and see.
On another related matter: Salafi murderers are a small minority among Palestinians. But they're there, and if you assume the Palestinians are Arabs or Muslims, their power and popularity could yet grow, as has happened elsewhere in the Arab and Muslim worlds. Salafists hate all sorts of people, including Italian fools who hate Israel, but they vehemently hate Jews. I think any reasonable person would agree that offering such murderers uncontrolled access to large numbers of Israeli Jews would be a bad idea. Yet that precisely is what most of the world, from President Obama down, insists is the key to peace, since Jerusalem must be divided and also remain an open city. I apologize for droning on about this matter, but I admit I'm personally threatened by the imbecilic idea.
Finally, a nice little note: The Guardian reports on Arrigoni's murder:
Update: Just Journalism demonstrates the British media are being worse on this story than I'd said.Arrigoni arrived in the Gaza Strip on a boat bringing humanitarian supplies in 2008 that Israel, which enforces a blockade on the tiny coastal territory, allowed into Gaza port. [My emphasis]