the argument is not "lets all share files until they go bankrupt"; it's "there is change afoot; whoever can make the awesomest, most loved art / entertainment of the next wave will win big".
you're not a special flower. the stuff you like is mass market. you will like even more whatever comes next - if you didn't, then it wouldn't be the next big thing. the argument is self-fulfilling; yc simply wants to be the one that makes money on it. don't be mislead by the macho "killing" rhetoric.