Soap was a bad example. Towels, blankets, pillows and shit like that. I've seen police called over blankets.
Something about hotels turns people into thieves. Washroom signs, awards the hotel has received, couch cushions, maids carts, pool chairs, weights, you name it. Sometimes it's kids, most of the time it's a grown adult. When caught they play the victim card and cry about the price they pay and they deserve more. Imagine saying, with a straight face..."No sir. Room service trays are not included in the rate. They belong to the restaurant" to a grown ass man. We offer free WiFi, and some people think that means they can connect to our WiFi after they've checked out and gone back to whatever city they're from. They call us, explain that they just stayed here and request the password because their device saved the network name so it must still work. Sad.
When you ask what people can steal, you really underestimate the stupidity of people that travel.