Well it is likely that DiCaprio has strong ties with them, taking into account that he joined the Hollywood industry at an early age, almost everyone who joins that industry being so young, inevitably end up associated with this type of problems. For years it has been said that celebrities can not deal with fame and that's why those little children who appear in films end up being drug addicts or sexual predators, but in reality, that has nothing to do with fame, it has to do with with the abuses to which they are subjected in that industry.