Some people don't get too bothered by the raw sewage dump. After all we've been flushing our waste into water our entire lives, so assuming all of that ends up in the rivers and the oceans isn't such a disturbing thought.
But then you have to consider all the things people flush down the toilet that have no business being there. In this case: Condoms. A shit-ton of condoms.
As you can see in the following video, the poop isn't what we should be worrying about.