Its detractors describe capitalism as selfish. Capitalism is a free market where individuals freely exchange goods and services in the self-interest of both parties.
Society benefits because competition motivates everyone to produce the best goods and services with the lowest prices.
Collectivism on the other hand, takes the property of those who earn it and gives it to those who have done nothing to earn it. Society loses because this reduces the motivation to offer better goods and services and prices. The more you earn, the more they take. Collectivism in reality is a whole lot more selfish than capitalism.