I think we have not only been warned but we have be shown over and over again. Unfortunately, until it hits some people where it hurts (physically and/or financially), they just don't/won't get it. Most Israelis get it. Look at how many people in Europe and the U.S. still side with the Palestinians--even the mayor of London. I wonder if he's reconsidering his POV just a little bit now. I hate to say it, but we will have to be shown several more times here in the States (and so will the people of England) before it finally sinks in.
What about those who support the Saudis? The Saudis are the SOURCE of almost all terror in the west.