[MentatOnMelange]

You realize that without the door it would be even more obvious whether the stall is occupied?

[jackyinger]

It's not about it being occupied, it is about what is happening inside.

[inetknght]

Everyone knows what's happening inside.

[magicalhippo]

Indeed, people are snorting coke. Hence why they want doors.

[xprnio]

Good thing they were already in the stall, as that coke was bunk, and cut with laxatives