I just wanted to offer some advice on the main essay topic as I know some people are racking their brain over this.
Consider this from the standpoint of values. If it is shocking to you then it's probably tripping upon some deeply felt principal.
Consider what that might be and speak from that place. Consider that they are trying to get to know you at the deepest level by understanding your values, what motivates you, and want to see if those values are a match for the Oxford Community.
To generate some ideas you might actually consider looking at successful essays for Stanford's main essay question which also speaks to values.
For the part about how you would change this, I think they are looking to assess your innovative and strategic thinking abilities. Be imaginative.
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