The open letter to them that was signed by artists from Sonic Youth, TV on the Radio, and a bunch of other artists and activists says it better than I could,

We understand you’ve been approached already by Palestinian campaigners. They’ve asked you to respect their call for a cultural boycott of Israel, and you’ve turned them down. Since Radiohead campaigns for freedom for the Tibetans, we’re wondering why you’d turn down a request to stand up for another people under foreign occupation. And since Radiohead fronted a gig for the 50th anniversary of the Universal Declaration of Human Rights, we’re wondering why you’d ignore a call to stand against the denial of those rights when it comes to the Palestinians. **

Radiohead once issued a statement saying: ‘Without the work of organisations like Amnesty International, the Universal Declaration would be mere rhetoric’. You’ve clearly read Amnesty’s reports, so you’ll know that Israel denies freedom to the Palestinians under occupation, who can’t live where they want, can’t travel as they please, who get detained (and often tortured) without charge or trial, and can’t even use Facebook without surveillance, censorship and arrest.

In asking you not to perform in Israel, Palestinians have appealed to you to take one small step to help pressure Israel to end its violation of basic rights and international law. Surely if making a stand against the politics of division, of discrimination and of hate means anything at all, it means standing against it everywhere – and that has to include what happens to Palestinians every day.

Otherwise the rest is, to use your words, ‘mere rhetoric’.

You may think that sharing the bill with Israeli musicians Dudu Tassa & the Kuwaitis, who play Jewish-Arabic music, will make everything OK. It won’t, any more than ‘mixed’ performances in South Africa brought closer the end of the apartheid regime. Please do what artists did in South Africa’s era of oppression: stay away, until apartheid is over.