[castwide]

Part of that problem might be explained by thoughtlessness, but I can think of four practical reasons:

1. "Trash" marks a spot where you intend to return. This can help ensure that you have a regular place to sleep.

2. What appears to be trash might have some value to the hoarder, e.g., trashy but wearable clothing, recyclables, etc.

3. Litter can camouflage minor valuables, so you can accomplish #1 and also have a hiding place for stuff people might steal.

4. Given all of the above, trash naturally gathers in a homeless community and eventually gets dumped however is most practical.