涨跌一句话，美股暴力反弹，现在真是入场的好时机么？

Group 1 - The article highlights a significant market reversal in the U.S. stock market, with the S&P 500 index experiencing a single-day surge of 9.52%, marking its largest increase since 2008 and the third largest since World War II [1] - Despite the dramatic rebound, the S&P 500 remains down 3% compared to a week prior, indicating that market recovery is far from complete [1] - The volatility in the U.S. market has reached unprecedented levels, with the VIX fear index recording its largest single-day drop, following a 90% surge due to tariff fears [1] Group 2 - The article discusses the contrasting sentiments in the market, shifting from "extreme fear" to "blind optimism" within a short period, driven by statements from President Trump regarding tariffs [1] - Analyst Jim Cramer emphasizes the importance of holding stocks even in desperate times, suggesting that the recent market sell-off was orchestrated by the White House and differs significantly from the global financial crisis [1]