"You can’t say we don’t have the money."
Actually, I can.
If WE had the money, it could be used for all those necessary things.
As Piketty's careful study has shown, about 400 inordinately wealthy people HAVE the money.
If "WE" can get our hands on it, certainly that would make a difference.
Note, however, that when Bernie Sanders makes noise about a tiny tax on Wall Street Transactions he's demonized, kept off the airwaves, or spoken of as an impractical dreamer.
The will that might organize to shift the dynamics that ALLOW enormous wealth to solidify into relatively few hands, and then observe as that wealth finds lawyers who dream up schemes designed to protect that wealth from taxation (usually in off-shore tax havens) is not allowed to solidify into a force strong enough to change the calculus that has Big Money calling the shots, owning the politicians, courts, judges, media narratives, and academics/think tanks paid handsomely to promulgate them.
In short, if WE had the money, we'd make different policies and most of us would use the funds to better the lives of more persons.