I’m saying sleeping on a bench that is meant for transit users to wait for a train is, indeed, anti-social.

This is fairly trivial to demonstrate using a categorical imperative. If everyone used the transit system to sleep in, then that transit system would likely cease to exist, and the benches would not be maintained.

We very much ought to have places for people to sleep. That those resources are rarely provided to many folks satisfaction is shameful. Still when public services are make less functional this can interfere with the literal viability of expensive transportation systems. They can rapidly become insolvent if transit consumers prefer alternatives due to the misuse of spaces.

The idea that need trumps all other factors leads us to inefficiency public services that collapse.