I don't think Blake has expressed it very well.

I'd say that Good is the impulse to love life and to love others, and that Evil is the direct result of a fear-driven impulse to simply grab whatever you can get, because you regard everyone and everything else as either a threat...or an opportunity. And...it's the result of thinking that you're "number one" and that everybody else is, like I said, either a desirable opportunity or a competitive threat.

The latter attitude of "looking out for number one" is so common and so institutionalized in this world by governments, schools, and big business that it pretty much dominates most of society, restricted only by people's fear of what their society may do to them...if they take it too far by breaking the civil laws.

Short of that, they are mostly encouraged (specially by the world of commercial advertising) to be self-centred, greedy, acquisitive, vain, insecure, jealous, competitive, and heavily addicted to one thing or another. It all makes money for someone if they are.