By Tzvi Machlin Of all the criticisms Phil Mickelson has received for joining the LIV Golf tour, the most significant arguably comes from the families of 9/11 terror attack victims. Mickelson and other American golfers were recently sent a scathing letter from families for their decision to join the LIV Golf tour, which is backed by the royal family of Saudi Arabia. The Saudi royal family has previously been implicated in a role in the 2001 terrorist attacks. On Monday, Mickelson addressed that criticism. He said that he has “sympathy and empathy” for those who lost loved ones in the attack. “…