Earlier quoted context omitted.
50 km/h to 30 km/h on a city commute doesn't make a substantial difference. If you're willing to risk people dying just to get to your preferred McDonald's three minutes earlier, then the problem is you.
I wonder if the "5 minute city" approach would also help. Just zone the cities so that getting that burger doesn't even involve driving at all, just a brisk walk?
And on the cons side… hurts oil execs, national and international retailers, and people who define freedom as having to pay $5 to exxon to get groceries.