Would you give a wrong answer just because everyone else did?
Three out of four people will deny what their own eyes see if the room disagrees.
In Solomon Asch's line experiments, participants were asked which of three lines matched a reference line - an obvious answer. When confederates unanimously gave the wrong answer, about 75% of real participants conformed at least once, even against their own eyes.
Asked which line was longer, people picked the obviously wrong one after actors confidently chose it first.
Group pressure can override what you plainly see in front of you.
A confident majority can pull you off a correct call - say your view before you hear the room.
A room full of wrong can bend one pair of right eyes.
Learn the idea and practice English at the same time.