For a value of "we all agreed" that expands to "was decided via a free and fair democratic process", then it appears that the Swedes did all agree, at least for a time, that this was a fair way for their government to use their tax money.

For any other value of "we all agreed" then it sounds like you're arguing that the vast majority of government expenditures are unjustified. That seems like a much more expansive claim than what you're trying to make.

Why should it be okay for the state to use tax money to purchase a tank or a mile of road but not to purchase a share of stock?