On Wednesday, NBA Lakers star LeBron James tweeted something that looked very much like an incitement to murder a police officer. James rushed to conclusions about the shooting of 16-year-old Ma’Khia Bryant, a black girl who appears to have been lunging at someone with a deadly knife when the cop shot her. James later took down the tweet, but he claimed that this shooting represents yet more evidence of systemic racism. President Donald Trump took him to task on Thursday night. “LeBron James should focus on basketball rather than presiding over the destruction of the NBA, which has just recorded...