Because it is easier that way.
Easier doesn't always equal beneficial or positive~ If you wanna keep things equal, find a way to give the break option to all people.
Better yet, find a government that actually knows how to spend taxes and give no tax breaks~ I feel any governing body (I'm on the record as against any kind of centralized social control, by the way) should be there to keep the balance and egalitarianism of all~
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