major actors in the economy have strayed from any reasonable standard of moral behavior

How come there is such a gap in the first place? Why do market economic goals are different from the so-called moral standard? Here's why:

The economy, like war, creates winners and losers,

In the market there is competition - what benefits me is a detriment to you and vice versa.

detriment of society (...) the greater good of society

There's no such unified interest in a contest.

The principles of a moral economy would seek to curb the market’s more harmful excesses while preserving its societal benefit.

In a “just” economy, venture capitalists would consider the collateral damage

That's another contest between rule-keepers and rule-breakers. Occasionally one of the sides will prevail but still, the motivation to follow the rules is not there. Every time I follow the "moral rules" I go against my self-preservation in the market.

"I want winners and losers but I don't want winners to win too much". To me it's like squaring the circle.

Applied ethics guide our interactions in the world as it exists while nudging us incrementally closer to the normative ideal and the world we seek to create

I don't like compromises. How about a structure where peace is the starting point and not a secondary concern? Where my gain is your gain as well or at least neutral.