either you believe that people should act ethically even if that means forgoing actions that they are legally allowed to make. if you believe that, isn't it wrong to build a free, open source competitor using all the knowledge you just got from working inside a company?
or:
you believe that business is the law of the jungle, and everyone is free to do whatever they can get away with legally. in which case why is it a problem for amasad to get lawyers involved?
it seems this dude's victimization relies on holding amasad to a higher standard of ethics than he holds himself. maybe he should because he has more money and power. or maybe not?