That's all well and good by most people.
Until someone they care about is victimized by a thug who is later found to have a houseful of pocketbooks, credit cards, cash, jewelry, etc., that belonged to a bunch of other people's grandmas, sisters, moms, daughters.
And then the question becomes, "He's been doing this for years; why didn't somebody stop him before he hurt so many people?!"
If I see something that does not pass the smell test, I'm going to make the phone call. I don't want my mother, sister, daughter or granddaughter to be the thugs' next victim.
YMMV
Are you saying that Trayvon had a houseful of pocketbooks, credit cards, cash, jewelry, etc., that belonged to a bunch of other people?