I wish all the left-foot-brake bashers would just give it a rest already.
And I'm a RIGHT foot braker! I know that left-foot braking can be done wrong, resulting in dragging brakes and always-on taillights and unintended acceleration, but you can screw up RIGHT-foot braking also. The only time I've ever even come CLOSE to "unintended acceleration" was right-foot braking and catching the corner of the accelerator pedal with the edge of my shoe in an unfamiliar car. Fortunately, I caught myself quickly.
I learned to drive on a stick-shift. My left foot is as useful as my right... and sometimes I brake with it. But when I'm NOT braking, its off to the left on the "dead pedal." Nothing at all wrong with using both your feet if you do it right.
And for the "its impossible" gang, I will respectfully suggest you change your song to "its UNLIKELY." The computer can't tell an erroneous input from the pedal position sensor from a real one. Yes, internally the sensor can have two independent sensors, but there's always a (slim) chance that they can erroneously output the same reading, or at least one within tolerance. And there's always just ONE pedal, so a mechanical fault in the pedal assembly can always pass the computer's tests.
But I'm not going to say "this would never happen without DBW." I've seen a few stuck throttle cables and broken throttle springs in my life, so the driver ALWAYS has to be prepared to deal with this kind of emergency. My real belief is that cars today are so flippin' well-behaved MOST of the time that a lot of driver awareness has been lost. Back in the days when your '62 Dynamic 88 was just as likely to backfire and stall as it was to go like bloody stink when merging into traffic on a cold morning, we were all much more practiced in responding to mechanical glitches that made the vehicle do something we didn't intend. I wouldn't want to go back to those days, but it is a fact that we're more insulated from the real workings of the vehicle than ever before.