That depends on the threshold for harm. But yeah, if you take the maximalist claim that any death or harm direct or indirect is unacceptable, you are basically arguing for no changes in society because we do not know the future and there is always uncertainty.

Conservative doesn’t mean reactionary, it is what it means now just like liberal now is taken to mean progressive, but that is not the real definition of the word it’s simply how people have been using them as a sort of shorthand.