Out of that shameful letter, five astronauts have direct business ties to Elon Musk or SpaceX. Three more, have indirect or advocacy ties to Musk. Also SpaceX and related Musk business have hired, several former NASA astronauts as advisors or consultants, so I guess for the rest we just have to follow the money.

Scott Kelly signed that letter, but not sure he would stand by it, when Musk associates start decimating NASA.

Oh, and since when did we start calling Space Tourists: Commercial Astronauts ? Dennis Tito spent 8 days at the ISS and nobody would call him Commercial Astronaut