I don't think negative vs. positive is a useful bifurcation here, both for biographies and scientific results. I'd rather we do interesting/surprising vs boring/expected. In other words, can we learn something from this? There are biographies of "failures" that are full of wisdom and reflection, as well as biographies of "successes" that have stumbled upon the success without so much as a second thought, and vice versa. Same for scientific results.