(rewriting this to remove my speculation)
1) I've seen rockets blow up for a lot of different reasons. Solids blow up because propellant grain cracks, liquids blow up because of leaks/runaway pressures... tons of reasons.
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3) Many articles I'm reading are painting the event as a very negative event, trying to make me feel sad/bad about this anomaly.
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6) The test was successful. Whatever design flaw existed was going to persist until engineers uncovered it. It is now uncovered. The design will be more Murphy-proof
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8) I made this video explaining my feelings about some non-test failures in 2015:
9) I feel the same way about this event.
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-Destin