"The explicit reason given, at least in the case of NYC, was the desire to make driving taxis more profitable. During the Great Depression there were more drivers than passengers and it couldn't pay the bills. How do we solve this? Limit the supply of drivers, therefore raising the price and reducing competition. From a consumer standpoint this is terrible."

Is it? If it's not paying the bills, then you're not going to have people doing it. Making sure that the price is at a point where it can sustain itself makes it much more likely that it'll still be there tomorrow.