The point being (which we both understand, but not everyone here does) is that in logical terminology, a "valid" argument is one whose conclusions must be true were its premises all true. That is a valid argument, even though its first premise is obviously false, because were its premises true, then its conclusion must be true. A valid argument whose premises are all true is a "sound" argument. But, while philosophers and logicians respect this "sound"/"valid" distinction, in popular usage the word "valid" is used to mean "sound".