It can help causes to which you are opposed, even on personal grounds. So not much brilliance there. Mainly four things. The first is to pay the salaries for their humongous bureaucracy. The second is to redistribute it amongst government-approved programs, companies or people.
Salaries are dependent on the other categories.
The less functions you take over, the less people you need to pay. Since in a free society all these sectors would be opened to private companies also, the government would be forced to fall back to a consumer-producer system. In essence, the government would derive profit from it only to the extent that it offers a service that the market deems preferable to its public alternatives. This would be one source of money. The last point is the one that creates the most problems.