"Just like when you go into a public restroom.......empty urinals up & down the wall but the next guy in will use the one right next to you "
Inquiring minds want to know... :)
Perhaps the reason some crowd too close is because, although they want to be alone, they really don't want to be "that" alone! There's some comfort in knowing someone is close by if a need were to arise for help. (I'm just guessing why they'd parks so close)...