You're debasing the currency that you're 'printing' to use in the helicopter drop. That means you're stealing purchasing power from anyone that uses eg dollars, to redistribute it to whomever is on the receiving end of that helicopter drop (which is almost guaranteed to not be everyone you just stole the purchasing power from).
Ever see Canadians complain about the value of their loonie in threads online? I see it constantly, they complain because they've lost purchasing power. What happened? The USD soared when the Fed stopped debasing it so aggressively with QE, and the Canadian economy went into recession because commodities are priced in dollars (leading to a double whammy).
The US effectively did helicopter drop trillions of dollars. The Fed's balance sheet presently represents a housing, bank, government and stock market bailout.
The bottom 50% don't own much in the way of assets however, so when you debase their purchasing power and send the value of the dollar plunging (post 2002 or so), their standard of living falls significantly. The rich could mostly care less, within reason, because their assets can often be shifted to better returns based on what's happening at the moment. Average worker incomes however cannot be shifted, they simply get eroded.
This is fundamentally why the median US worker has seen almost zero inflation-adjusted income increase in 40 years, post Nixon's choice to debase the USD. No coincidence the cost of everything has soared (including commodities), perfectly timed from that fateful decision.
It's also no coincidence that every nation's GDP simultaneously skyrocketed - priced in dollars - when the Fed began debasing the USD around 2002/03. In vague terms that represents the vast loss of purchasing power that the dollar experienced, to the benefit of pretty much everyone else. It's also why, when the dollar turned back the other way after QE stopped, emerging economies like Brazil crashed so hard and fast (as the USD pulls capital out of Brazil like a gravity well), and it's why China is bleeding such large sums of capital right now (as occurred on a smaller scale across Asia the last time the dollar went on a big bull run in the 1990s, leading to the Asian economic crisis of 1997).
If you're the Fed and you run actual 3% to 4% persistent inflation (while lying and pretending the CPI is accurate at say 2%), and worker wages climb by 1% to 2% per year - then over 20 years the average worker gets destroyed.
In pretty much every country a helicopter drop has been tried, it has led to inflation in relative proportion to the size of the drop. Inflation harms the poorest the most (see: Venezuela, Argentina, Zimbabwe, Russia, Brazil). The US is a bit of a special case in that regard, because it can export some of that inflation to the world via the global reserve currency, which helps blunt the amount of inflation that immediately hits the domestic economy. That inflation often finds its way back however, which we may see shortly with China liquidating its treasuries.