Why is it so hard to find Non-Lethal Ammo? Is it really better to use "Less-than-lethal" over live ammo?

A lot of folks tell me that it is more trouble than it is worth to buy and use "Less than lethal" ammunition and I should just use live rounds for self defense. Is this really true? Which is more likely to keep you out of court trouble if used in self defense, live ammo or non-lethal stuff?
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