> Getting more bikes on the road makes bicycling safer. Drivers in cars are much more careful when they see bikes everywhere than when they only see them once in a blue moon.

I'm aware of this, but the infrastructural camp tends to assume that it's obvious these effects outweigh the problems with infrastructure. I'm not certain. I think a hybrid between the vehicular and infrastructural approaches is necessary to get the benefits of both with minimal downsides. This means recognizing the problems with infrastructure and avoiding them.