Contact is to be expected in a close race. But it is certainly not required to make a pass in this game. Here's an example that we had to bring up a few weeks ago. I had a straight line speed tune with no downforce and another driver with a wing was using my draft to stay close and applying loads of pressure through the turns where he could carry more speed.
http://www.youtube.com/watch?v=JgguGmT-s40
On the first lap, we have a good drag to denger curve and my car (the one in front) had more straight line speed. I out brake and there is minor contact. This is close racing and I took a risk coming into that turn from the inside. Nothing wrong there.
On the second lap, in the esses I get tapped from behind exiting the final right-hander. Honest mistake maybe, but i had to lift off slightly and correct my angle to the next turn. As I'm turning in for the final left-hander apex I get hit not once, but 3 times and am eventually pushed off my line and into the gravel pit. The pit maneuver could have easily been avoided if the driver had lifted off after the first hit.
I have spoken to the driver numerous times and several other hosts in my club have banned him from certain events for rough driving.
But anyway, I'm not against contact in racing...I'm against using contact maliciously and ruining other's race. Do onto others. Anyone can pit maneuver...it takes skill to pass without contact.