I am a big Joe Biden fan. The vice president is an indefatigable defender of U.S. interests abroad. So it pains me to say that on his recent trip to Israel, when Prime Minister Bibi Netanyahu’s government rubbed his nose in some new housing plans for contested East Jerusalem, the vice president missed a chance to send a powerful public signal: He should have snapped his notebook shut, gotten right back on Air Force Two, flown home and left the following scribbled note behind: “Message from America to the Israeli government: Friends don’t let friends drive drunk. And right now, you’re driving drunk. You think you can embarrass your only true ally in the world, to satisfy some domestic political need, with no consequences? You have lost total contact with reality. Call us when you’re serious. We need to focus on building our country.”

I think that  rather than fuming and making up  would have sent a very useful message for two reasons. First, what the Israelis did played right into a question a lot of people are asking about the Obama team: how tough are these guys? The last thing the president needs, at a time when he is facing down Iran and China  not to mention Congress  is to look like America’s most dependent ally can push him around.

And second, Israel needs a wake-up call. Continuing to build settlements in the West Bank, and even housing in disputed East Jerusalem, is sheer madness. Yasir Arafat accepted that Jewish suburbs there would be under Israeli sovereignty in any peace deal that would also make Arab parts of East Jerusalem the Palestinian capital. Israel’s planned housing expansion now raises questions about whether Israel will ever be willing to concede a Palestinian capital in Arab neighborhoods of East Jerusalem  a big problem.

Israel has already bitten off plenty of the West Bank. If it wants to remain a Jewish democracy, its only priority now should be striking a deal with the Palestinians that would allow it to swap those settlement blocs in the West Bank occupied by Jews for an equal amount of land from Israel for the Palestinians and then reap the benefits  economic and security  of ending the conflict.