Why are most 7-Elevens so sketchy?

I’ve noticed that most of the 7-Elevens I’ve been to are sketchy, dirty, and just overall have bad vibes. Even if they’re in a good neighborhood, somehow only that small part of the neighborhood is the only sketchy part. There’s a RaceTrac and 7-Eleven a couple of minutes away from me and that RaceTrac is really clean and every time I go everyone there is normal-looking. The 7-Eleven is literally right in front of it, but half the people that I see there are sketchy-looking and the place is so dark and dirty. What the fuck is this?