Most tax deductions can be explained as rewards to various voting blocs for support. In his "Rules for Rulers" video (https://www.youtube.com/watch?v=rStL7niR7g

Most tax deductions can be explained as rewards to various voting blocs for support. In his "Rules for Rulers" video (https://www.youtube.com/watch?v=rStL7niR7gs https://www.youtube.com/watch?v=rStL7niR7gs) CGP Grey draws an analogy from dictators needing to pay their generals to ensure continued support, to democratic politicians giving out tax deductions to businesses to ensure their support.