This was already addressed in earlier posts. The volunteers said it happened so fast and they were shocked. They did look for an official but they didn't have one around and then he was gone.

The OP said that he entered the tent and stood in the doorway and did it in clear view of all to see. He did not wait and even attempt to go to the side or where he was changing. He did it in doorway where every athlete entering barefoot would step in his waste. It is crude, rude, unsanitary and depending on what bugs this guy might have even dangerous. I would think WTC would have some rules regarding basic sanitation and if not should be reported to the health department. If they are unwilling to self-enforce maybe someone else should.
Besides just because you have done it doesn't make it ok. It may seem ok to you but it isn't ok. Against the rules of conduct.