Does it make sense to you that you can't carry on a bottle of conditioner, hand cream, water or soda (over 3 oz) on a plane but yet you are allowed to carry on a small knife?

I know that the pilot is locked in the cockpit. I know that the size of the knives allowed in the new TSA regulations are quite small. On the other hand, I am trying to comprehend the logic that knives are ok but liquids like soda or water are still banned.