As much as I admire pop bands like Faithless, Gorillaz (love them!), Carlos Santana, Elvis Costello, The Pixies, Gil Scott Heron, Devendra Banhart, Snoop Dogg, and The Klaxons (the list goes on) who declare their reluctance to perform in Israel, there might be another option.
It is certainly a brave thing to say no to your fans and to high-level exposure, not to mention the big bucks. It might be braver to go there and tell the audience that ticket sales will be donated to pay for much needed medical supplies for the people of Gaza. Now that would be something else.