Bikes should give way to cars:

• Cars are bigger
• Cars are faster
• Cars are powerful
• A car can hurt a biker
• Cities are built for commerce, and powered vehicles are the engine of commerce
• It's inefficient for a car to slow down
• I'm in a car, get out of my way
• I'm on a bike, I'm afraid

Cars should give way to bikes:

• Bikers need a break
• Bikers are more fragile
• Bikes aren't nearly as powerful
• A car can hurt a biker
• Cities are built by people, and while commerce is a side effect, the presumption that cars are the reason for a city is a bit… presumptuous
• It's a lot of work for a bike to stop and start again
• I'm on a bike, get out of my way
• I'm in a car, I see you

This dichotomy is, of course, a metaphor, a Rorschach that tells each of us a lot about how we see the world.