The heart and tear duct are connected via what I would like to call an "emotional superhighway". Everytime the heart cringes in pain, sorrow and defeat, an almost instant reaction of tears will well up. Insta-tears. This is most common in women. Not all women, but most nontheless.
In the emotionally retarded man, it takes a little more than just average cringing of feelings. In men, tears are usually painful. Painful to admit and painful to release. So, when a man wails and drowns himself in tears, its because he can't take it anymore. Its because its all gone to a point that if he doesn't wail and cry his heart out, he WILL go insane. Emotional realease. Again, not all men, but most.
The sight of a full grown man crying is anything but pretty. Its embarrassing, degrading and un-macho. No man would admit to it, and no man would openly do it. Yet, somehow, it helps. Yet, somehow, everyone has done it at least once in their lifetime. Yet, somehow, we all feel better afterwards, both men and women. It all seems temporary, but temporary relief is better than none at all. Ask the heroin addicts, they all know.