Argumentum ad ignorantiam is fundamentally about what concept?

Argumentum ad ignorantiam, also known as an appeal to ignorance, is centered on the idea that a proposition is considered true simply because there is no evidence to refute it. This logical fallacy occurs when one assumes that a lack of disproof validates a claim. For instance, if someone argues that there are no extraterrestrial beings because we have no definitive evidence of their existence, they are committing this fallacy.

This reflects the concept that just because something has not been proven false, it doesn't equate to it being true. The validity of a claim should rely on evidence supporting it rather than the absence of evidence against it. Understanding this helps in critically evaluating arguments and recognizing when reasoning is flawed because it relies on the unknown rather than factual support.