Even in a utopian communist society there would be showrooms for products, to help people select what best meets their sleep/medical needs. Those beds would be unused too.
It is a separate issue, that the showroom is not responsible for, that resulted in a homeless person not having a bed.
Systemic issues have systemic solutions. If you try to apply a local solution to a systemic problem, you just kicked the can. (As in, letting homeless people use the showroom beds).