As you can imagine, not everything that Elon does or says is related to SpaceX. Moreover, SpaceX employees, as well as employees of other companies, have the right to disagree with the CEO of the company that employs them.
Doing so in an open letter is a frequently encountered way of expressing such doubts, and we know this because these letters often get leaked or are supplied directly to the press.
The folks over at The Verge have published the letter in full. It has three main requests. The first is related to Elon's Twitter behavior.
Since the CEO of SpaceX has signed an agreement to buy the social network, one cannot help but wonder how such a request can be fulfilled. Thankfully, the letter explains. It asks for SpaceX to distance itself from Elon's comments on Twitter.
The employees who created the letter also want to hold all company leaders accountable to make SpaceX a "great place to work for everyone." While the letter does not put a finger on the issue, it does mention "applying a critical eye to issues that prevent employees from fully performing their jobs."
The open letter also asks for transparency within the company, as well as rigor and urgency in solving these problems as if they were related to hardware. The last request in the open letter refers to a clear definition of the company's rules, specifically the "no-asshole," and the "zero-tolerance" policies that are not entirely clear to all employees, as well as the repercussions for unacceptable behavior, which are either not clear, or not applied in a uniform manner.
SpaceX has not yet issued a press release regarding the letter.
Update 11:10 UTC: SpaceX has reportedly fired several employees who wrote the letter. The open letter was criticized by the company's president, Gwynne Shotwell, as being "overreaching activism," among other statements. You can read her letter to the company in the press release section below.