Averaging has Dilution Effect on your Argument

“The most robust psychological explanation for this is averaging." Rather than adding up pieces of information in their minds.. “So when you introduce irrelevant or even weak arguments, those weak arguments reduce the weight of your overall argument.”

E.g. drug advertising. Commercials never end right after listing of major side effects, but rather on minor effects or neutral information. Consciously or not, they're using the dilution effect — watering down consumers’ assessments of drug risk