[simook]

I encourage you to do a little more research on this. Bad and good bacteria exists in this world regardless of how Human's try to control it. Waste processing plants use a combination of bacteria and UV to treat wastewater. That process is very similar to what nature does with animal and human waste.

However, moving human waste is a tough problem and requires substantial resources (fossil fuels, infrastructure, electricity, etc...) and the act of moving it is usually the source of contamination.

I think it's completely valid and beneficial to compost human waste, but that needs to be done on a local/individual scale.