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agreed, but i think op’s point was that where two different people would decide to stop something or to intervene is a defining characteristic that separates them
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Remember, /r/Showerthoughts is for showerthoughts, not "thoughts had in the shower!"
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Morals were a construct of society not the individual until the Nuremberg Trials were forced to make the distinction that one cannot just follow orders, yet we continue to prosecute Whistle Blowers to this very day and so it seems we have learned nothing. >

Morals have never been a construct of society and to think one event in the last 100 changed anything is ridiculous >

... So what would they be constructed by? >

I was just watching a video on Moral Development (subtopic of Developmental Psychology) that I'm reminded of. It's about how children/people develop morals. The focus is on how they arrive to a conclusion regarding a dilemma (a man steals heavily marked-up medicine for his dying wife)...how do you justify the action of stealing?
The stages (according to Kohlberg's theory) go from preconventional (what is the consequence of my action? e.g. the man shouldn't steal because he might go to prison) to conventional (what would society think? e.g. the man should steal to be a "good husband") to postconventional (what are my overall ethical principles? e.g. committing a small crime for the greater good).
Postconventional is where we start to consider "social contracts" and "abstract ethical principles" which I think relates to this showerthought.
And Developmental Psychology is about how we become to be who we are in terms of physical, cognitive, social and emotional factors. So I would say that your reasoning and justification for morally grey scenarios is a defining characteristic of you but probably not the "main part" because there's so much to psychology. >

I mean, it's easily possible for any situation to fall into a more sharply defined area of your morality as well.
I think it's probably much more correct to say that morality is one of the main defining characteristics of you. The gray areas mean less without the whole picture and spectrum.