Remember that comment by the Harvard psychologist Paul Bloom about economists being evil? Well, this isn't a retort on that comment, but it could just as well have been:
Economics does not make people greedy, self-seeking, maximizers; economists take this type of behaviour into account only because it seems fairly prevalent. In an ideal world, it might be nice if people weren't this way; I'm not sure. But basing decisions for the future on fantasies and hopes that we all can be and will be sharing/caring people leads to really stupid policies.
Neither economics nor economists made a world of scarce resources, either; economists do nothing more than tirelessly point out the problems of scarcity and the implication that we cannot all have everything we want, including social programs and flowers in the park.
But because economists insist that scarcity and greed be taken into account in the analysis of policy issues, others (who think people shouldn't be greedy and that the problem of scarcity would go away if only people weren't so greedy) seem to think economics is the source of the problem. And when their Pollyanna schemes don't work, they blame economics instead of their own naïveté.
Like they say, read the whole thing.