First, let's look briefly at revenues. (Yikes!) Revenues can be expected to grow at the same rate as the overall economy. The long-term growth rate of the economy is about 3%. ..... Therefore, the long term growth rate of revenue should be 3%. The actual long term growth rate for revenue is about 5.0%.
(This is basic stuff, everybody.)
Now, let's look at spending. Its long term growth rate is greater than 5.0%. Spending's long-term growth rate is 5.5%.
Growth of spending exceeds growth rate of the economy and growth rate of revenue. That is why debt is increasing.
Any spending item growing faster than the economy should be reformed to slow its growth.