This country is so great with the oppurtunity that I'm in favor of a set % based on earnings. Whether I have kids (or choose not to), own a house, gamble, get stolen from, buy an energy conserving vehicle, move to another job (my choice), etc, etc, I pay the same as the next. I wish the govt would wipe the slate clean and start over again.
Because: If I live at the bottom of a dam and it breaks under a storm, I'm stupid for living there and the govt doesn't owe me. If I live on a hillside in a quake zone and it hits and my house is destoyed, the govt does not owe me. See the trend? The govt shouldn't be an insurance policy even if I would benefit.