Who are these people?

Who are the people that feel the need to use a public restroom and then throw 6 trees worth of TP and paper towels into the toilet, rendering it an un-usable and unsanitary mess?

Whoever the intended victim is, the person who suffers the most will be the janitorial staff forced to deal with it. I just think it's incomprehensibly cruel. I dunno why people do that.