As weird as it's going to sound, not guilty. I don't like to argue to start with. I usually back down because I have neither time nor patience to argue. That said, when I do stand my ground, it's 99% of the time because I'm right and I know it. I'd rather let someone else be right, think they are right, or just ignore them if I'm not sure of my own righteousness.
The next person will have been guilty of using the toilet and not flushing.