While currently reading Scrum: The Art of Doing Twice the Work in Half the Time I came across the “bandwagon” effect where for example in meetings someone comes up with an idea, and everyone starts talking about it. Even if you disagreed first, you go along, because the group is going along. People assume that if everyone else is going along with something, their own reservation is silly or misinformed, and they don’t want to look stupid in front of the group.
Remember, this groupthink isn’t an individual failure; this is a human failure
People assume other people are making sound judgements, even if those judgements contradict their own
This reminds me not just to follow blindly the crowd and if you have another opinion to a topic, just say it and use the other opinions to improve your own. Don’t just blindly forget your own opinion and don’t just blindly replace it with the opinion of someone else.