Your company may make decisions that you don't agree with or are objectively stupid. There is a proper channel to voice your concerns. They may be ignored in which case you can leave if you feel strongly enough about it. This is what adults do.
TBF, the behaviors they are complaining about are so far away from "what adults do". Honestly, tma lot of people could be having a better inagine of SpaceX now that their letter is on the open than during the awkward silence phase.
What should the appropriate response be ?