I didn't think there was anyone that doubted that a tax cut typically raises revenue. One of the better known proponents was John Kennedy.

The stated fear of the left is that "it might not work this time" and their precious entitlements might suffer. Also, since any tax cut is of greater impact on higher income brackets their reluctance plays well with lower income, special interest groups.

It is based on false fear, just like touting SS funds into a lock box and reluctance to invest a portion of SS funds in the market.

This is not to say that there is not a point beyond which you should not go. For instance, the current interest rates are so low that further decreases may be of doubtful value to stimulate the market.