Economic mistakes permeate Welby’s ideas, but they stem from a deeper philosophical omission: Forced actions do not have the same moral value as actions which are freely chosen. It is more valuable for an individual to freely decide to pay for healthcare for someone who cannot afford it than for that same individual to be forced by the government to provide that care.
The United States Constitution was adopted to “…provide for the common defense, promote the general Welfare, and secure the Blessings of Liberty…”. Note it is Liberty, not force, that is to be established. Force is evil and is to be used sparingly.