What does Amazon have to do with this? Nobody is saying that service trucks transporting goods should go away. Obviously they cannot. And nobody is trying to completely abolish private personal transportation either. But those who need to use a personal car also benefit from more people using public transport, via reduced congestion!

Of course, there's coordination problem here: ceteris paribus car users benefit from other people shifting to public transport, as long as they themselves don't have to switch. This is why it is important to make public transport a genuinely attractive option, and to put a price on the negative externalities caused by private cars, for example by means of congestion charges.