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I've thought about this as well before. I think SRW's explanation is good, but I've got a little to add. If you think about the mechanics of a baseball swing vs. a softball swing.
In baseball the swing is a much longer monster. A larger step is taken, hands and arms are extended through the zone (unless they're fighting off an inside pitch). When you extend your arms through the zone like in baseball, it's tough to hit yourself in the back.
In softball, the swing is much more compact. The emphasis is on turning quick and quick hands. There is not nearly as much extension in the softball swing which is why when they power through, they end up smacking their shoulder/back area.
This is just what I've come up with having played baseball and having a sister that plays softball and watching lots of both games from umpiring. Just my 2 cents.
-Josh
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