Each cryonics customer is fully responsible for making his own decisions and living with the consequences. More importantly, cremation and burial, which are the only other apparent alternatives to cryonic suspension, put the patient's personality at infinitely greater risk than cryonic suspension does. The choice is not between cryonic suspension and having one's teeth cleaned, but between cryonic suspension and drastic molecular disintegration. What we have here is an argument over terms, definitions and classifications. In order to establish a pecking order, assign social status, allocate resources and set funding priorities, we engage in a name calling game.
Science is a discovery procedure, a methodology for finding truth and also falsehood.
Note that science is not truth, but a tool for defining and validating what is true and false. A scientist earns his title by following the scientific method, not simply by being right or truthful. It follows that scientists can believe and propogate untrue statements and still qualify as scientists because they professionaly practice the scientific method. Cryonics per se is not science. Medical practitioners apply the results of scientific research, they do not themselves perform it.