I look at all this from a different point of view because of my personal history. In the years after 9/11, I was very depressed and self-destructive, and I believe any concerns about someone's mental health should be taken very seriously.
What I see in this thread is a lot of speculation, and very little facts about what happened at Vince's house and why he left home for the evening. Maybe he did get in an argument and storm out angrily to go for a drive. Or maybe he threw down his phone and said: "If I can't be the best, I don't want to be anything" as he stumbled to his car. My point is: we don't know what happened and we shouldn't make conclusions without all the facts.
A family member has to use his/her judgement, but I say err on the side of caution. If you think a family member is in a 'bad' state of mind, you should intervene. I don't know whether the best person for Vince's family to call was the team, the police, another family member, or someone else. But I won't jump to the conclusion that reaching out to the team was the wrong course of action in this case.
If possible, it's best for everyone, including fans, to be non-judgemental and accepting, and, hopefully, patient.