I hit a girl on a bike once and have been hit 3 times myself. it does way more damage to your car than you would think - and yes, even more to the person on the bike. the bike will always get destroyed.
some of you with the "fuck the bikers" attitude would probably find it best not to live in Boulder - I was looking into moving out there back when I was in high school and had friends out there. at that time ('94/'95) there was a news item of a car doing what you say and basically bumping over someone that was yielding to them (bikes, legally, are the same as cars on the road - once they get off the bike, then they are legally pedestrians). this guy bumped the bike aside and started driving on.
Boulder is home to pretty much all the high level professional endurance athletes in the states. so as he felt he was going to be driving on, they went after him, somehow managed to break his window, pull him over, and beat the shit out of him on the side of the road.
so I guess they aren't the pussies you feel they look to be. must be the spandex.