Fallacy

A fallacy is a kind of error in reasoning. The vast majority of the commonly identified fallacies involve arguments, although some involve only explanations, or definitions, or other products of reasoning. Sometimes the term “fallacy” is used even more broadly to indicate any false belief or cause of a false belief. The "Bandwagon" fallacy works on the basis that something is correct, true, or good just because most people think it as well. For example, "Donald Trump is the best president to ever live because he supports our veterans and has done so much, that's why I support him." Obviously it is a completely fallacious argument. Just because so many people agree with each other about someone or something doesn't mean for one second they are all correct. The argument here is, many of the US presidents have supported our military veterans and have honestly done a lot more.