Car enthusiasts have been apt to criticize SUVs as irrational because few owners ever take them off-road. But, by the same token, how many owners of high-performance sports cars drive them at anything approaching their full potential? Venturing beyond cars, how many owners of diver’s watches actually scuba dive? And how many dSLR cameras are being used just like a $99 point-and-shoot? Clearly people are psychologically attracted to high-performance objects, even if they won’t actually utilize the potential of these objects. This doesn’t mean that the objects themselves don’t make sense. And yet, during my week with a Lexus LX 570, I struggled to make this 5,995-pound, technology-packed, luxurious SUV make sense.