Because the CDC is a criminal enterprise with no accountability and immune from liability.
Letter to Dr. Rochelle P. Walensky, Director, Centers for Disease Control and Prevention
Anaphylaxis is a serious allergic reaction that is rapid in onset and may cause death. It typically causes more than one of the following: an itchy rash, throat or tongue swelling, shortness of breath, vomiting, lightheadedness, low blood pressure. Common causes include insect bites and stings, foods, and medications.
I hope someone backed up the JAMA hospital study linked in the letter you link to, because it has now disappeared into the ether. We've got nothing until we find the (probably deleted ) study.
Isn’t it swell that our own government censors the Internet by concealing their documents they don’t want the public to see when the science contradicts their narrative.