I was right behind a fellow C6 driver at PIR a few years ago on a rainy day. He got just a little off the line at the beginning of the back straight, got into a tank slapper and ended up straight into the wall. And that was not even a passing situation.
So free passing on a wet Pacific Raceways would scare the crap out of me. Like chriszeh said, the odds of getting taken out by a someone who doesn't know what they're doing would be much higher than usual HPDE levels...