Sure, but that can happen to an individual with any substance - I might take any given medicine that I haven't had before and turn out to be viciously allergic. But if I take a homeopathic 'remedy' that contains an antibiotic previously usable to treat, say, E. coli, and have no noticeable reaction to it, then I just silently create a new strain of E. coli in my gut that happens to now be immune to the antibiotic, just itching to be caught by someone else when I forget to scrub my hands thoroughly... nothing bad happens to the individual, but the species suffers for my gullibility.
> Sure, but that can happen to an individual with any substance
It's particularly common with penicillin. This is why people who are allergic to penicillin know about it and check their medication so that they don't get some accidentally.
This is IMHO probably the reason for this recall: it is an immediate danger to a significant number of people. Sadly increased antibiotic immunity in the environment is not viewed with the same level of concern as a sudden medical crisis that causes next of kin to sue.
