From Dean Baker:
In addition to conflating Social Security and Medicare as “entitlements” that will pose problems, the column also has a few other standard scare tactics. For example, it projects a rise in spending from approximately 20 percent of GDP at present to 40 percent in 30 years. The biggest part of this rise is due to a rising interest burden. See, if we run larger deficits, and Congress never responds by either raising taxes and/or cutting spending, then we get a rising interest burden. Silly trick, but this is the Post.