Strongly disrupted ecosystem is probably more prone to invasive species. I'm quite surprised that we are getting away with daily washing let alone antibacterial soap. Burning meadow to the ground every few months would let only the most resilient weed to survive and flourish. I think we are just lucky that none of the bacteria that are less prone to washing away, that we allowed to flourish to unprecedented levels by washing away their competitors is not fatally harmful to us. I hope we will get to undestand this whole thing better before some of that resilient fairly harmless bacteria evolves flesh eating capabilities.