Perhaps he is right that the excuses being used are no good for current American city planning, but I have a strong feeling if you were to tell the Bike Faggot the real reason why there is little support in the US for "walkable cities," he would call you racist.
The US currently has far too many cases of criminals being let off when they should face severe punishment. And in many cases, more severe than they already get. The death penalty is a strong deterrant, regardless of what the midwits who say "life in prison would be worse than death."
They don't factor in that the murderers tend to not think the same thing, given how they fight to delay the death penalty. Because it turns out a lot of murderers are stupid, and need more fitting punishments.
And back to "walkable cities," if we get more Iryna Zarutskas being murdered, people are rightly going to avoid public transportation when they know the government is not going to punish these murderers properly.
You need a high trust society to have "walkable cities" be a realistic prospect. And if you don't have high trust, you need severe punishment as a deterrant. Anyone who does not support either of these options is a fool or an enemy.