The main argument against group selection has always been that, well sure, it would be nice to have a group of cooperators, but as soon as you have a group of cooperators, they're just going to get taken over by free-riders, individuals that are going to exploit the hard work of the others.
O argumento principal contra seleção de grupo têm sido sempre que, claro, seria legal ter um grupo de colaboradores, mas, assim que temos um grupo de colaboradores, eles simplesmente serão controlados por oportunistas, indivíduos que exploraram o trabalho árduo dos outros.