You are correct, spending cuts are just as important as tax cuts, but given a choice of one - I'll take the tax cuts which might force the starvation gambit.
As I think I once saw - the fiduciary pecking order is thus:
Spending one's own on one's self
Spending one's own on other's
Spending other's on one's self
Spending other's on other's
As you state - Govt has the LEAST incentive possible in responsible spending of the people's money.
The whole point of the article was that cutting taxes increases the cashflow from which Govt's take, evan at a smaller percentage rate = more revenue.
Yep, the Laffer Curve works. Now we need to convince gov't idiots that cutting taxes to zero is even better. Think of all the money you'll get then, parasites!