"I have yet to see anyone who is drawing a principled line between Jews and israel."

Then you are not paying attention. The test is simple: Do they talk about all Jews as though they are Israelis or Zionists?

Do they talk about all Israelis or Jews as though they support Likud?

The critics of Israel that I pay attention to, like Norman Finkelstein, are very aware of those distinctions.

Not a fan of Buchanan or Buckley, so I can't say who was right there. But I do know Zionists love to duck hard questions by claiming antisemitism lies behind them instead of the ongoing dispossession of the Palestinians.