The truth is I don't believe this. Not because killing bacteria is bad, but because I do not trust the people managing the operations and because I know with certainty I cannot trust the government to monitor it. I write from the US so you know what I am saying is true.
When someone seeks to introduce novel and dangerous proceedures, I believe the burden of proof of safety is on them, not the victims.
I know this differs from the conventional view that it is the victims' job to prove how they have been killed. The Fates are kind.