Does it ever not matter?

Two things happened in the last 24 hours that share a common theme in my mind, and it made me think.

This morning, one of my coworkers joked that he was using a blue cutting board to cut beef. There's a color-coded system with the cutting boards, see: red is for beef and pork, blue is for seafood, yellow is for poultry, white is for dairy, and green is for fruits and vegetables. This is the joke, though: this particular coworker as far as I know is the only cook who is still following the system; he was actually cutting salmon. If he's the only one following the system, is the system really even meaningful?

Last night, my wife and I were watching the movie Yesterday. If you don't know it, it's a movie in which a struggling musician gets hit by a bus, and when he wakes up, he discovers he's somehow in a world where the Beatles never existed, but he can remember all their music. So he starts performing Beatles music, and it catapults him to stardom. This is the subtle thing about it: while he is enjoying fame and fortune, you can see that he's tortured because he knows he's not really a brilliant musician, but rather a plagiarist. But is it wrong to plagiarize music that never existed and nobody will ever know that it's not yours? (We only finished about ⅔ of the movie, and there are hints that some sort of reckoning may be coming, but whether or not, I think the question stands.

So the thing I'm pondering is whether a moral or immoral act retains its moral value when the context for its morality is removed. As the title of this post suggests, is there ever a time when morality doesn't matter? And I'm not talking about situational ethics, which I've written about before; those are a matter of one moral issue being overridden by a more pressing moral issue. Is it possible there are times when something that should be a moral choice ceases to be because it's simply divorced of sufficient context to make it matter any more? I feel like using the right cutting board is something one should do regardless of the fact the last person to use said cutting board chopped up raw chicken on it. I feel like plagiarism is always wrong, even if the source of your plagiarism has no chance of being discovered (a potentially real issue in the age of AI). But am I wrong? What do you think?