>>Why do we have a tax deduction for Charity, or interest on mortgages, or depreciation.<<< Charity- gives us a choice of where we want our tax dollars to be spent versus the government picking all the charities. Mortgages- For our economy. Homebuilding drives our economy like nothing else. WE all share an interest in having a vibrant economy. Depreciation- Just keeps you from taking the whole write-off all at once.