The exact same way the government pays for anything else, be it subsidies to artificially lower the cost of corn or milk, more equipment that the US military has asked Congress to stop buying, forever wars over oil procurement, world class unlimited healthcare for politicians, subsidies to the ultra wealthy and corporations by way of waiving their tax liability, bloated contracts for projects that still end up exceeding their budgets, increased pay for members of the military who quit with the goal of immediately getting rehired as a civilian contractor doing the same job for more pay, roads, teachers, conservation efforts, airport security, border security, disease research, energy research and nuclear materials transportation, space research, etc.

Taxes

You’re gonna pay taxes regardless. The government uses that to pay for so much stuff–some shit, others useful. Wouldn’t it be nice if we diverted some of the shit spending to nice spending?

Edit: I realize this comment is US centric, and this ain’t exactly the right community for it, but we have the same problems in the States and the same oft-repeated ill-conceived retorts about paying for stuff. My final point remains true. You’ll still pay taxes, why don’t you prefer they go to good things?