Who did it? Chairman Arafat's protestations aside, if (and I stress if)responsibility for these acts lie with Palestinian elements--however radical they may be--Israel no longer needs to concern itself with negative US public sentiment if indeed war comes to the region.
In fact,--and I mean this SOLELY in a very narrowly-defined strategic sense--if Palestinian elements are responsible for this attack, American support of aggressive Israeli action in defense of its sovreignty and security against Palestinians and their apologists will be similar to U.S. support/acceptance of anti-Bolshevik talk and action made by the Germans during the 1930's (i.e., "American First"-ers who saw Nazi Germany as a "buffer" between Western Europe/United States and the Soviet Union).
How can American sentiment go against a PM Sharon who chooses to deal with the "killers of innocent Israelis and Americans alike" in a far more aggressive manner than he has previously-?