IMO, Religion should be free to make illegal, things that the government say are legal, but is should not be allowed to make legal what the government says is illegal.
For example, with abortion or gay marriage, the government may allow it, but a religion has to right to prevent it amongst its members. However, with something illegal, such as murder, freedom of religion should not be used to allow it. This is how the system generally operates.
The grey area, which affects JWs, is when it is hard to determine exactly what the legal situation is. Should the Watchtower be allowed to prevent a blood transfusion, and does that constitute manslaughter? Should the Watchtower be able to enforce shunning, and does that break the United Nations Universal Declaration of Human Rights, Article 12 which states:
“No one shall be subjected to arbitrary interference with his privacy, family, home or correspondence, nor to attacks upon his honour and reputation.”