"Got dark" means the sun went down. That's why I mentioned that the lateness of the hour mattered. By "they", I mean poor kids that just "hang around". At first I ignored them and considered them to be like I was when I was a "lower middle class" kid just hanging around. But I came from an intact family. I learned these kids were "not like me" in their culture. They were potentially dangerous. Yes, they were mostly black, but it was not the race that concerned me, with one exeption - I learned to be rightly concerned that they may be racist against ME. I saw some pretty harrowing stuff there.
BTW, one day my wife and I were on a bike ride and had stopped for coffee in teh international district of Seattle (used to be called Chinatown). Suddenly some asian kid, looking to be about 15, came running around a corner about half a block away. Soon, about 15 more "kids" came around the corner chasing him. They caught him and proceeded to kick and beat the living daylights out of him, while lots of people looked on. I ran over there and started grabbing kids off of the "pile" and one taxi stopped and the driver and I were the only people there that didn't just stop and watch.
In that case, "they" were a bunch of asian kids. I'm not a racist, but I am most definitely a "culturist". This means that typically an activity will be "mostly" comprised of one race or another, but it's not really about the race of the people involved. It is about the subculture of the people involved.
I put it this way:
You are walking down a dark street where there seems to be nobody else around, and a bunch of young men (6-8) approach from the other direction. As they approach, which group makes you most nervous
Group 1: They are wearing slacks and polo shirts or button down dress shirts and talking about a professor they hate, or they are chiding one of the guys about his car being a beater. They are all black.
Group 2: They are wearing hoodies and pants slid down 8" below the waistline. They are punching each other and talking about where they can get some beer or dope. They are laughing about one of them getting a girl pregnant. They are all white.
Before you answer, let me ask you this: If group one is all white and group two is all black, is your answer different? For me it isn't. My concern comes from their apparent culture, not their race.