I'm a scientist. I have no issues with the process of turning sewage water into clean drinking water. Absolutely none. However, I do have an issue with humans. Humans screw things up. Humans don't always implement the proper quality assurance programs, and when they do, they might not follow them. Every time I pour myself a glass of water from the tap, it's not the science I'll doubt, I'll just be wondering if Timmy down at the local water treatment plant did his job properly today, because if he didn't, I'm now drinking someone's shit.