This is a self-solving problem for the doctors speaking out. If the hospital would rather fire them than ensure their safety, then getting fired can save these doctors' lives.
It might be hard for them to get jobs after, though. I'm not in healthcare, and I know that doctors are always in high demand, but we can't ignore the cost to those protesting by risking their careers. So many whistleblowers face intense retaliation and career problems after coming forward, and I'm sure being perceived as a snitch wouldn't do one any favors down the road, even if you're a doctor.
Anecdotal, but all the healthcare workers I know (both nurses and doctors) entered their professions because they have a genuine desire to help people and save lives, so I don't think they'd be willing to endanger their jobs right now when they know their continued employment could be a matter of life or death for their patients.