Argument from ignorance

An argument from ignorance (), or appeal to ignorance ('ignorance' stands for "lack of evidence to the contrary"), is a fallacy in informal logic. It says something is true because it has not yet been proved false. Or, that something is false if it has not yet been proved true. This is also called a negative proof fallacy. This also includes the (false) assumption there are only two options (true or false). There may be as many as four choices:
Appeals to ignorance are often used to suggest the other side needs to do the proving. Rules of logic place the burden of proof on "the person making the claim".
A logical fallacy is simply a bad argument. Using bad logic does not necessarily mean the argument is false (or true). It is basically a hasty conclusion, one that is arrived at incorrectly. But it still may be convincing to some audiences. This is why it is used in politics and advertising.