1: Philosophical ability is "almost" universal in mind space. Utility maximizers are a pathological example of an atypical mind.

I wouldn't spend much time thinking about this alternative, because it will probably be true for some ideas of "mind space" and false for others, and I don't believe we have enough information to describe the correct "mind space".

2: Evolution created philosophical ability as a side effect while selecting for something else.

Many people think the ability to argue and comprehend arguments arose due to runaway sexual selection for ability to manipulate and resist manipulation. I'm not sure how to test such an explanation.