No idea why would the brake lights be on if you rest your foot on the pedal without actually pressing it. Granted, I only drove a BMW 318i, Mercedes 550sl, a Subaru Forester and a Toyota Land Cruiser equipped with automatics, but you could comfortably keep your foot on the pedal without engaging your brake lights in all of them. I mean, if you press AND engage your clutch pedal on a manual all the time while driving, you will burn through it in no time. The same logic applies here - you can rest your foot on a pedal and engage it only when needed. It then becomes very natural one foot for braking, one for acceleration. It should also be natural for anyone riding a motorcycle or a sports car and is quite logical.
The speed difference between one foot and two foot setup should not be a debate either.
There is a danger of pressing both pedals simultaneously. But a decision of lifting your foot from one pedal, moving it and pressing on another pedal is more complex, and thus more problematic in more stressful situations. I know that this is not 100% applicable to cars, but if someone removes right hand from the brake lever during a motorcycle exam, that is an automatic failure on any advanced riding course.
Even IF we take your example of pressing both pedals simultaneously in a stressful situation, by the same logic if a person keeps only one foot on the gas pedal, he is going to engage it just the same, while doing basically nothing with the other foot.
So this is a choice between engaging 100% throttle, vs 100% throttle and 100% brake. And FYI, some manufacturers are using systems that account for these mistakes and if brakes and throttle engage simultaneously, throttle is disengaged automatically. Meaning clearly that they are considering this mode of driving not as an oddity, but as a proper technique. As it should be. For example:
https://www.businessinsider.com/brak...tandard-2012-5
It is also going to be mandatory safety system for the US sold vehicles in the very near future
https://www.reuters.com/article/us-a...-idUSKCN1SJ1UL
The main reason why it was not enforced yet in terms of legislation is that practically all manufacturers already use this system in cars produced over the past 10 year period.