 This sounds like a powerful example—who likes germs? The question in reality reveals an absence of consideration of the established benefits and values of variety itself. The gut microbial context is particularly revealing—over the past decade or so, reductions in an individuals’ variety of gut microbes (e.g., as measured using the PD biodiversity measure) is now associated with more than a dozen different human diseases. This biodiversity possibly provides a kind of insurance benefit in healthy individuals (see the link to “Phylogenetic Diversity and Human Health”, in  Other Internet Resources;  for other philosophical issues related to microbial biodiversity, see Malaterre 2017).