Is the Session Liquidity Shift Trapping Trend Followers?

Why does the dominant trend established during the London session frequently reverse within 30 minutes of the New York open? New York market open brings a massive influx of fresh institutional capital, high frequency market makers, and economic news releases. The first movement at 8:30 AM EST often acts as a stop sweep of the London session high or low before setting the true direction for the rest of the day. Do you trade the London trend continuation or wait to trade the New York reversal sweep?