The writer doesn't seem cognisant of rhetorical observation, which he might have figured had he read the final paragraph in Mr. Will's essay:
Americans consider deferral of gratification unnatural, which it is. Time was, however, thrift was considered a virtue. People sat at kitchen tables, calculating how to bring their outlays, for living and retiring, into alignment with their incomes. But eventually many people decided: This is no fun. Instead, let’s disconnect enjoyable spending decisions from tiresome facts about resources, thereby living the way the federal government does.
You're right...the basic thrust of Will's column was not bemoaning the tax cuts but worrying about many Americans' failure to save for their futures. He's probably right.