Even without "lying" what do you think governments are going to do? Even if they went around and flat out said it what do you expect governments to do. In the US Watchtower won the Bryan case in Washington. This was even as the court says assuming all of the facts in the most favourable light of the non-moving party, the person disfellowshipped, there is nothing that a civil government can do to stop disfellowshiping.
Even in Australia the only part that the ARC was able to bring up for disfellowshipping is that involving those who experienced child abuse. A government would have to treat religions differently between themselves and most western developed nations have prohibitions on that.
And I know that people on here like to say Watchtower and JWs are are not a religion but is a cult, but that is not how the law sees it. Even this thought that Watchtower falls under the B.I.T.E. model for cults that is not a legal thing. The model and in fact, the whole thing of brainwashing by a cult has not established a science and doesn't work in courts or dealing with lawmakers. They can only investigate using means that is generally accepted by the scientific community.