Jackson died in 2009. His family and estate have long denied the allegations contained in “Leaving Neverland.” But the documentary raises uncomfortable questions about predatory behavior. Among them: How does a mother luxuriate in a hotel suite while her young son is in bed with a grown man a few floors away? At least part of the answer is a grooming process in which victim and family come to trust and care for the accused predator. Viewers may pat themselves on the back for being smart enough not to let their children sleep with a gloved pop star. But look at Larry Nassar, the USA Gymnastics doctor accused of molesting hundreds of girls and grooming an entire community. Or at the hundreds of abuser priests who were widely trusted figures.