At first glance you'd think the correct use of the expression "too bad" would be in a conversation like this:
Sure stealing candy would be bad but stealing candy from a baby is just too bad.
But instead we more often use the expression either sarcastically in cases like this:
Yeah, I got it first! Too bad. You lose.
or as a synonym for "unfortunate" such as in:
It's too bad that you can't come to the party.
But why did we come to use "too bad" in this way that seems to be little related to the literal meaning of the words?