Then why crush the option? Let the market determine it. If Intuit's product is so much better then it will win.
In other words, for the same reason we have laws against unfair competition.
Business for the sake of business is not necessarily good. If the business does not provide real value any longer, it shouldn't exist.
Government for the sake of government is never good.
Some things lend themselves very well to for-profit businesses. Others do not. Firefighting and filing your taxes to the government strike me as two things the government can probably handle better than capitalists.