I'm just reading Dawkings Selfish gene and it attacks pretty fiercely against "group selection". But I find it impossible idea that any part of human behaviour

I'm just reading Dawkings Selfish gene and it attacks pretty fiercely against "group selection". But I find it impossible idea that any part of human behaviour could be completely detached from genes. And especially weird if Human behaviour could influence genes, wihtouth anykind of feedback from genes back to behaviour. How can you explaing phenomena like this withouth group selection? From selfish gene point of view, a brain that is even capable to think about risking life to fetch dead body of friend* should be strongly selected against. * (and therefore some individuals might act on it very occasionally)