At the end of the day, It isn't Oxfords fault. They cannot take applicants that do not have the required grades or skills for the courses simply because they are poorer, or from a state school. The problem should be addressed much further down. Oxford are doing a lot more than some universities to try and widen participation, and if the government tries to force them to hit quotas, it isn't fair on the university.
As someone from a state school/poorer background, I would hate to be accepted into Oxford simply because they wanted to look more diverse, and it isn't fair that the government picked on one specific university either.