The thing is, religious organizations can get away with a lot more - all in the name of freedom of religion.
The question is why does WT insist on this rule and not just let it be none of their damn business what medical treatments the congregants receive. Why would this issue need to be a do or die deal-breaker for people? The GB could call it all off and call it new light but they don't, why not? There is something more than "bible command" at play here.