I don't get this comment? Separating what? Pedestrians and cars? Cars and bikes? Isn't this also mostly done? I mean that's the idea behind bike lanes for example. There are limits to the amount of separation possible though.
> I mean, not everyone has the possibility of walking a couple of streets to buy a cappuccino and then take an elevator to the office. Try having kids in a city today and then let's talk.
I don't get this comment. Is there no cafe near you? Also, you still shouldn't speed in residential or mixed neighbourhoods, regardless of where you live. Even if your office is further away. People live there. A highway and ring road usually takes you reasonable near you office, for most cities in europe and I bet every city in the US.
> Try having kids in a city today
What's the difference to having a kid in a city in the past? Cars certainly grew bigger and that's strictly worse for having a kid in the city.
I get not wanting your kids to grow up in the city, but that's also your own decision. And if you end up with a long commute others shouldn't bear unreasonable consequences. Others might raise their kids in the city and the kid might want to cross the road (assuming it is old enough) without a fear of death from thousands of cars speeding by.