[hellcow]

What is the common good and who defines it?

If I plant a fruit tree in my garden, I no longer buy that fruit from a local farmer. Thus, I hurt the farmer.

If I build Facebook, I hurt MySpace. If I build Spotify, I hurt iTunes. If I build assembly robots that save businesses and consumers millions, I take away jobs from factory workers.

Anything you build upsets the good of someone else; that doesn't make it wrong.