Implementing liberal leftist policies like not reporting those 45 warning calls they had about the shooter.
Every state has tools to detain mentally ill people who pose a threat to the public. All 50. The reason why the police didn't take action any of those times is because they simply don't care. The problem is with law enforcement.
But don't take my word for it. Here's your very next sentence:
Not arresting people so that their crime stats. would look good for the purpose of getting grants.
More evidence that the problem is with law enforcement. Thank you.