Because it’s good at killing *everything* when it’s concentrated enough.
Killing viruses/bacteria generally isn’t all that hard. Applying enough heat or alcohol is simple enough.
The trick is killing the virus/bacteria *without excessive harm to the host.* The levels of heat and concentrations of alcohol sufficient to kill viruses and bacteria are also generally sufficient to kill animals like humans.
That’s why we have antibiotics. They’ll kill the bacteria without killing the human.
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