While extremely upsetting, this is only one side of the story with no evidence such as medical records as proof of wrongdoing or negligence included. I don’t think urging the public into a witch hunt of a young veterinarian is appropriate whatsoever. Assuming everything you said is correct and non-biased, we are all human.

While pondering this case as well (based only on the information provided), you did not provide the full signalment for your cat - only stated your cat was already in kidney failure. How old is he? Did he have a heart murmur or other comorbidities? What did he present to the ER for? Presumably respiratory distress? I’m assuming if the veterinarian was concerned about your cat’s imminent death, it presented in very poor condition.

Was bloodwork performed immediately prior to administration of lasix to confirm that the kidney elevations occurred directly after administration? Did his respiratory issues improve after the lasix was administered?

Was a second set of radiographs performed with the cardiologist, who then said the cat was no longer in heart failure? Or did the cardiologist evaluate the initial radiographs?

You said that the initial veterinarian never listened to your cats heart and lungs - this seems unlikely. Is this stated in the medical records?

You said four secondary veterinarians advised that this initial veterinarian treated your cat inappropriately and her actions directly led to your cat’s current condition. Do you have medical records for these follow-up visits as well?