The point of the analogy is that cutting your hair does nothing to solve the actual issue of obesity. Some of the people in the comments are arguing that the money spent on research is very little and that it ends up bringing in more money for the government than the initial investment. It would be like looking at an investment someone made that had a great return and arguing that they could save money by not investing the money in the first place. They could be wasting money on other things but cutting a profitable investment is not going to save them money.