The bandwagon fallacy assumes that something is true simply because a number of other people support it to be true.
For Example:
Do you see all the flat-earthers? There has to be some truth to it since so many people are on board with it.
Or… all of these people could be wrong! So don’t be fooled by the bandwagon fallacy. Even if the majority of the people support something, that does not necessarily make it true.