Paul Bloom

Our best hope for the future is not to get people to think of all humanity as family - that's impossible. It lies, instead, in an appreciation of the fact that, even if we don't empathize with distant strangers, their lives have the same value as the lives of those we love.

The irrationality of disgust suggests it is unreliable as a source of moral insight. There may be good arguments against gay marriage, partial-birth abortions and human cloning, but the fact that some people find such acts to be disgusting should carry no weight.