An Appeal to motive is a form of logical fallacy that's related to ad hominem attacks. This particular fallacy is when an argument one is making is questioned due to his or her supposed motives.
- "You atheists are rejecting my evidence because you want to sin."
- "Those scientists are only promoting global warming because they want more funding."
- "You don't want to have a professional apologist on your show because you're scared of the truth."