You make some good points, but the purpose (if it can even be called that, since it's more an absence of noise than a presence of silence) of silent cars is not

You make some good points, but the purpose (if it can even be called that, since it's more an absence of noise than a presence of silence) of silent cars is not just so "cool kids can go 'whoosh'". Noise pollution is a serious problem. Not as serious as transportation system safety, but still serious.