He seemed good. Then again rondo, kg, and perk all tore their acl.
Guys, trainers/medical staff have yet to create a traumatic injury. Their job is to help players recover from trauma.
Ligament/tendon tears are common in a sport like basketball. Protocol and empirical research helps the medical staff determine a treatment plan. Lacerte doesn't wake up one day and say, "oh KG seems fine, lets play him" or "I think he should sit b/c of the look on his face".
Rehab is highly documented and measured, especially for expensive players.
Certain structural injuries happen. There is no way to prevent them. Putting blame on a medical staff for a torn X,Y,Z seems ridiculous.