Appeal to motive

Examples

• "That website recommended ACME's widget over Megacorp's widget. But the website also displays ACME advertising on their site, so they were probably biased in their review." The thesis in this case is the website's evaluation of the relative merits of the two products.
• "The referee is a New York City native, so his refereeing was obviously biased towards New York teams." In this case, the thesis consists of the referee's rulings.
• "My opponent argues on and on in favor of allowing that mall to be built in the center of town. What he won't tell you is that his daughter and her friends plan to shop there once it's open."

• The Democrats want to impeach a President for withholding aid until he received a "personal favor" with Ukraine, and to "dig up dirt on a political opponent". The witnesses however admit this to be "speculation" and "presumption".
• "The Democrats wanted to impeach the President long before this Ukraine thing came out, so this Ukraine thing cannot be anything more than a hoax that comes from their sheer hatred of the President."