Re: Untested engine? @ MD Rackham
I guess you didn't read this part of the article.
"In 2007, the unattached rocket engine using that fuel was being tested on the ground in the Mojave desert when it exploded and killed three of 40 engineers observing the test. Investigators found that safety regulations at the site had been violated and that the men killed had been too close to the rocket motor."
An earlier incident true but basic safety rules were not followed. I grew up with the space program in Florida and played chess with a number of the engineers at the Space Center. Lots of people died at the space center. You only really heard about the Astronauts.
Don't let the narrative get buried in all the crap we have seen in the posts above. Concentrate on the investigation. I would suggest you read Richard Feynman's appendix to the report on the Challenger disaster.