In all your examples, the person receiving the cash either earned it (bonds, government employees) or will pay for it (student loans). A voucher is a gift from

In all your examples, the person receiving the cash either earned it (bonds, government employees) or will pay for it (student loans). A voucher is a gift from the government (taxpayers) to an individual. That's the key difference. Usually, people earn their cash. When they earn it, we don't get to control what they do with it. In fact, we don't even get to know what they spend it on. That is the beautiful thing about cash. To restrict people from spending their money on their religion illegally restricts their expression of their religion. When feasible, the government shouldn't be giving cash to people who didn't earn it. That is a core principle of welfare and that is why we have WIC, food stamps, government-subsidized housing, and school vouchers. It isn't feasible to have coupons for everything so we have to give people cash for some things.