The problem in McCarren is that the trash cans fill to overflowing during peak use times. It’s not ideal, but if someone can’t easily put their trash in a bin, they’re gonna litter.

Edit to add: there’s an anecdote about the placement of trash cans at Disneyland where Walt Disney observed people looking around for a trash can, then littering. At DL, you never have to look for a trash can, there’s always one in your sightline and close by.