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Me: let's not do <thing> unless we have a reason.

You: We should continue doing <thing> because we already do <thing>

"carry on" is not a reason to do anything. I literally can't understand how you are thinking to post such a non-justification.

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Sorry, I don't understand where you are going with this comment. I was explaining how UV can be used to save energy. You're arguing against that?

If you're talking cost then maybe. In the right places such as hospitals, very likely. I'm questioning that we should do that indiscriminately in other places such as in homes. We have highly developed immune systems, let's not risk weakening them. And not doing it costs nothing at all.

GP argues against killing microbes. (With some nuance)

Germs cause disease. I know germ theory is pretty new but its established science.

It is also suspected that germs keep us from being allergic to everything

Germs also cause immunity. You do need exposure (vaccines help, but aren't enough).

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