It's really easy, the man is Schizophrenic, during the call the police did what they had to do to protect themselves. The family of the man doesn't want charges pressed on him. The police were responding to their call.
NYPD bodycam shows officers responding to a Queens mental health call; a 22-year-old appeared holding a kitchen knife as officers drew guns.
abcnews4.com
Guy needs serious mental help. I don't think the police did anything wrong, but I also think honoring the requests of the family should be considered as well. IF it's met with mandatory medical treatment. he should be in a psych ward ASAP.