The government can (and does) take a loss all the time where private companies wouldn't. If something affects 1 in 1000000 people the government could lose money researching it while the private pharms might ignore it. Obviously this is good and bad. If they handled the research then we might have better antibiotics but no viagra. So I guess you'd be guaranteed to get old and not enjoy it.
Should the government (or anybody) be in the business of taking money from everyone, by force if necessary, in order to spend it on research for a disease which only affects 1/1,000,000th of the population? In what way does that even make sense? Do you realize that by saying government should not only do this, but accept a loss in doing so, you are saying that your money should not only be forcefully taken from you and distributed to causes which net little gain?
Government has no incentive to provide quality, cost effective service, since they can never go out of business.