...how two intelligent people can look at exactly the same information and come to opposite opinons"

The reason is because they each also come with other information and experience and background which also influence them - in other words with "bias". There's nothing wrong with that, it'd be impossible to come to every situation with a blank mind, and it wouldn't be desirable either; but the other factors that enter into the judements we make should be disclosed, and the information etc available to be shared, and judged.