Mass Shootings

Please help answer these 5 questions.
Question One: In 81% of violent, targeted school attacks, at least one person knew someone was conceiving of or planning an attack. In most cases, no one came forward with this information. Why might someone hesitate to come forward?
Question 2: What are some significant differences between school shootings and mass shootings in the general population (for example, the Colorado movie theatre shooting or the Orlando nightclub shooting)?
Question 3: Discuss the challenges inherent in preventing mass shootings in schools, the workplace, and the general public. Are there any proven strategies to help control this type of violence?
Question 4: What ideological differences might interfere with making meaningful criminal justice reform to prevent mass shootings?
Question 5: What are some other barriers to criminal justice reform?