"...waste the money on things, like walls, space exploration, and the military."
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Where does 67% of federal government spending go?
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Entitlement programs received about 67% ($2.6 trillion) of the $3.9 trillion federal budget in 2016.
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Defense received 16% ($605 million), interest on the debt 6% ($240 billion) leaving 11% ($429 billion) for all other federal programs combined.
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If you are going to comment on federal spending you should at least understand where the vast majority of federal spending is going. https://www.cbpp.org/research/federal-budget/policy-basics-where-do-our-federal-tax-dollars-go
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Hint, it is not "walls, space exploration, and the military." Not even close.