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This is like asking, "Why can't I decide to enjoy broccoli if I believe it's healthy to eat?" The evolutionary story behind curiosity notwithstanding, it seems to me that this is just a case of the more general observation you can't alter your desires simply by reflecting on whether they are good or bad.

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Except that you can, by just doing the things you want to do until they become habits. It's not really much different than going to the gym or deciding not to drink too often. Even though you might want/not want to do the thing, you still do it because you know it's better for you.

The better way to say it is that it's difficult to alter one's desires via reflection, not that it cannot be done.

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