the non-emotional reasons we have tears is to keep our eyes clean and hydrated .. so you would have tears in your eyes when there is a foreign element which enters your eyes .. thats the way the human body protects the eye ..
the other kind of crying is what babies do ... atleast the vocal part of the crying is related to the lack of communication skills of the baby .. also crying was a way to ensure that the baby can reach its parents in case they are separated (which i assume wasn't very uncommon when we were wild)
now the more complicated kind of tears .. the one which we get when we get too emotional .. there is one evolutionary reason for the same.. its old people copying the babies .. most adults have an urge to show sympathy to anyone crying (because they associate crying with babies and adults are wired to take care of babies) .. so when attacked or under distress humans would start crying to mimic babies which increased their odds of being spared ..
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