Am I wrong for moving someone else’s laundry?

So I recently moved into an apartment complex that has 36 tenants in my building. We all share 2 washers and 2 dryers for laundry that are located in the middle of the building (have to go outside to another door to access it for myself)

I took my load of laundry in there this morning around 10 after getting groceries and there was 1 washer out of order and the other had someone’s clothes in it but done. Long story short I waited 3 hours, checking every hour for them to move their laundry, but finally I gave up and moved it for them into a dryer and left the door open for them.

Is it not proper etiquette to do this? I mean leaving your laundry for 3 hours and who knows how long it’ll actually stay there is much worse in my head. How can people be this inconsiderate? It’s shared between 36+ people, don’t do your laundry if you’re leaving to go somewhere, or are just, that’s why waited until after I got groceries or I knew my own would be sitting there unattended for 10-15 minutes after it was done.