Argument from silence:

Evidential Fallacy
Definition Example
When a conclusion is deemed true based on the lack of opposition. Because my opponent failed to address my point, my point is validated.
Also known as: argumentum ex silentio
If a point is not addressed, rarely does it become anything other than an unaddressed point. However, this is context-dependent. If you see a vampire sitting across from you on the subway, and none of the other passengers seem alarmed, you might first consider what medication you might have taken that morning or checking whether it is Halloween before taking action since the silence of the other passengers in such a setting would be unusual. The key question to ask is “How unusual is this silence?”

Case Study One

The disinterest and subsequent silence of doctors on the claims of dubious medial remedies is often spun to imply their tacit support, or at minimum, their lack of opposition.

Case Study Two

The phrase “no comment”, which can be uttered for a wide variety of reasons, is often spun by the media to evoke suspicion of a secret or mystery

Case Study Three

The disinclination of physicists to give credence to the frequent invoking of quantum physics to argue for unexplained phenomena is seen in their lack of interest in debating these claims. Their silence should not be interpreted as condoning such claims.

Keep in mind that a fallacious argument does not entail an erroneous position.

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