What would be the evolutionary pressures of horned simians?

I am assuming that monkey like animals are more likely to develop some form of horn or antler than apes(feel free to correct me), the question is what would be the most plausible function of the horns, defense or mating, and what type of environment would select for this as a favorable trait?

As for why monkeys over apes, the opposable thumb and greater intelligence seem like they would be able to fix most problems, and evolution of this type wouldn't happen, also monkeys seem simpler, and more likely to go either way on the brain v brawn route.

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What would be the evolutionary pressures of horned simians?

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