Let's start it this way. Since a market system is a system of profit and loss, naturally, both profit or loss will play a vital role in the equation or system. Capitalist economies depend on markets when it comes to their economic activities. The market's role is to serve as a basis for them in determining what profitable activities and enterprises should the people invest on.Without the presence of loss in the equation of a market system, these people will not be able to determine where they should invest and/or withdraw from. Therefore, people base their decision of using their resources through knowing first the profit and loss. The loss will help them go away from companies or activities which will bring the losses.The downside for using the government in shielding companies from having losses is that the government will be abused by these companies. Since all companies will naturally want to not experience having losses.