Editor, Times-Union: Recently M.I.T. experts made it clear that the vaunted Iron Dome defense system built and financed by U.S. taxpayers to protect Israel is nearly a total fraud. In fact, it endangers Israeli citizens because it gives a false sense of security. Each ineffective Iron Dome anti-missile missile cost is 100,000. Hamas rockets cost $500 to $1,000 each. Your Republican U.S. Senator just voted to spend a few hundred million more on this Maginot line-style fraud. Tom Metzger Warsaw, via email