There are two points here. One is about the rights around freedom of religion and expression versus the potentially greater priority of preventing people from needlessly being caught in a high control organisation.
The second is about the motivation of the Russian authorities.
I don't believe they have a clear, moral and reasonable argument as to why they wish to prevent WT publications from being distributed. They simply don't like it and are cracking down, just as they prevent members of the LGBT communities from driving for having a "mental illness" and just as they imply state acceptance of many forms of prejudice rather than encouraging an open and tolerant society. Russia, at a state level, is culturally backward and pretty crappy place to be if you don't confirm to the norms.
Just because the state might be doing something with some benefits as far as the distribution of WTS material is concerned it does not mean we should be patting this racist, homophobic and oppressive regime on the back.