Some folks think it's not for lack of trying
Originally Posted by Ockham
from the article upthread
China's stockmarket crash: A red flag | The Economist
Yet China’s intervention has screamed of panic. Had the central bank stopped at cutting interest rates—justifiable support for the economy when inflation is so low—that would have been reasonable. Instead, there has been a spectacle of ever-more drastic actions to save the market. Regulators capped short selling. Pension funds pledged to buy more stocks. The government suspended initial public offerings, limiting the supply of shares to drive up the prices of those already listed. Brokers created a fund to buy shares, backed by central-bank cash. All the while, state media played cheerleader. Far from saving the market from drowning, the succession of life buoys only pushed it further under water. The CSI 300, an index of China’s biggest-listed companies, fell almost 10% over seven trading days after the rate cut. ChiNext, an index of high-growth companies that is often described as China's Nasdaq, fell by 25%.
Theories have flourished about why the government has waded in so heavily.