That's like arguing that yes we should use knives, because some knives are better than others. Whether some are better is irrelevant - what matters is they're useful. Those without a nation, without a group identity, are outcompeted by those with one. The person preaching individualism in a team sport is either incredibly ignorant, or simply malicious.
It also discounts the value of groups, absent concerns about competition. No man is an island, and the society you grow up in, the people you grow up with, greatly affect who you become and what your life is like. To say it doesn't matter who you live around discards all that, or reveals the profound mistake (or lie) of thinking who makes up a society doesn't affect what the society is like.
It also discounts the value of groups, absent concerns about competition. No man is an island, and the society you grow up in, the people you grow up with, greatly affect who you become and what your life is like. To say it doesn't matter who you live around discards all that, or reveals the profound mistake (or lie) of thinking who makes up a society doesn't affect what the society is like.