IIRC, it was the glue or foam they used to adhere the tiles to the shuttle Columbia that they changed because the lefty thumbsuckers threw a tantrum over it somehow being ‘environmentally unsafe’. So, NASA went green and lost some of the spray foam at liftoff. The rest is a tragedy in history. I had a supervisor’s aide (AKA, a butt-kisser) tell me a few years earlier that his father was a security supervisor in Mission Control when the Challenger’s tank blew. He told me the details of what his father saw. He said they knew from the telemetry that some of the astronauts were alive and conscious in the cockpit and crew compartment all the way down, until impact. I thought he was telling a fish story, until the details slowly leaked out about the disaster, and it corroborated everything he told me.
It won’t be anywhere near the last unnecessary fatalities because of liberal scum.