Consumer spending accounts for about 70% of GDP. The top 5% of consumers by income, account for 20% of consumption spending or 14% of GDP. This subset of consumers is market sensitive and will back down their spending when investments are in the trash. 14% of GDP is a big deal. If this group cuts back their spending by 1/3 it could lead to another ~3M people losing their jobs.
Not really gaming the system but taking advantage of the sell-off to buy great american companies at attractive prices. From an economic standpoint, it helps owners of equities feel richer and more confident about their financial position and thus more likely to spending money and invest. I don't recall any time in history when higher equity prices ever hurt the economy. Plus, the Fed stands to make decent long-term returns buying at or near current multiples.