When the Government puts money into the economy, it’s small and targeted, and almost always causes price increases in that area — be it infrastructure or defense. And that’s small dollars. Here we’d be talking about trillions of dollars being given to people — who wouldn;t be getting it unless they were poor(ish), and so would go out and spend it, pushing up costs for everyone else.
The issue in Weimar and African nations is when they run out of food, they have given the public money to pay for it, which merely creates an inflation spiral. In this instance it would be much smaller, but the effect would be the same.
And if you think you could just reduce it as time went on — good luck. I am liberal, but even I know that no social programmatic spending has EVER been reduced.