Your typical capitalist shill responses to anyone who mentions the word socialism:

1. It's human nature to be selfish, thus capitalism.
2. It's never worked before.
3. Humans can't co-operate without monetary incentive.

Let's explore these, shall we? 1. Being self-interested doesn't undermine cooperation. You wouldn't want to live in a household full of people who exploit each other, would you? If anything, it's in my interest to build a world in which everyone is happy and not exploited.