There can be no absolute answer to this one because it totally depends on the situation.

When the positive outcome of a situation depends on mutual respect and cooperation (such as in a football game), then this statement is true.

When the attitudes/actions of the whole are a detriment to society (such as the Salem Witch Trials), then this statement is false.

Self-expression & being a team player are not necessarily at opposite ends of the spectrum.

• This statement could mean that losing touch with your individuality in favour of the group consensus is the right thing to do. However, I think that a balance between self-expression and social cohesion is 'more important' than either thing in its extreme. You can express yourself in a way that takes consideration of other people into account. Being [a good 'team player'] (https://www.dummies.com/business/human-resources/employee-engagement/ten-qualities-of-an-effective-team-player/) = communicating effectively, which includes both expressing yourself & listening to others.

• Having a bull-headed sense of your own self-expression that overrides cooperation with others is selfish and non-communicative. And on the other end of the scale, studies have shown that stifling [the expression of your thoughts/feelings/ideas] (https://psychcentral.com/blog/a-mini-guide-for-expressing-yourself-effectively-with-anyone#what-is-self-expression) can alienate you not only from those around you but from your sense of self. Being a team player is important — but it shouldn't come at the cost of self-censorship, and it doesn't need to.