As usual, the more I examine logical fallacies, the more I see how people blend their fallacies into dreadful monstrosities. I have had many experiences where people will attack by asserting that they have a bad or ulterior motive, so be careful of Proof by Assertion because it lends itself to reinforcing other fallacies. " Proof by Assertion " (sometimes "Proof by Repeated Assertion", a relative of Circular Reasoning ) is one of my favorite fallacies because I encounter it so very often. In its simplest form, Proof by Assertion happens when someone declares a "fact" without offering supporting evidence: This is similar to the mantra, "Evolution is science, creation is religion". An assertion with an excuse. I still say, "Disingenuous". That was a very strange assertion and cop-out. Another reason that I like "Proof by Assertion" is that it is conveniently linked with