Quote:
Originally Posted by ADL Colin
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Yes, a Modus Tollens can be a valid syllogism which denies the anticedent.
But in most cases (like these ridiculous UFO claims), the arguer is often affirming the consequent.
And, like any argument it is just as likely to fall victim to GIGO. A syllogism can still be valid but nevertheless untrue. If one premise is untrue the whole thing is false.