Having a car on campus

I keep seeing people mention having a car when living on campus is a bad idea, and it's stressing me out. I am coming from Arizona and will drive to Eugene (the plans have already been solidified). If I left my car at home, it would be rotting in the sun for a year. And I didn't want to give up driving. With this in mind, I have seen a few people on different posts mentioning that it's not worth having a car, and now I am feeling a bit stressed about it. Why exactly is bringing my car a bad idea, aside from cost?