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hmmm...maybe its talking about something like a gory accident, for example, when someone gets shot in war, and another person sees it...that person sort of lost their innocence or part of it since they've witnessed life's harsh realities.

..did it come from something? I would need to see it in context to know if it's referring to something else.

Im guessing that the person who caused the trauma has lossed their innocence because, well, they traumatized the person by doing something wrong/bad! Thats what I get from the quote anyways...

When something bad happens, some people feel permanently damage while other use it as a growing experience.