I'm with Coded Logic on this one. I am no apologist by any means but freedom of religion is a fundamental human right, no matter how problematic we might personally find various belief systems. The bottom line is that no government has the right to tell any human how or what to believe. Moreover, from what I've read about this ban, it appears that Russia is aiming at the fact that JWs criticize other belief systems, which involves freedom of speech.
Dictators and other oppressive regimes often start with the low-hanging fruit, the most extreme or least widely accepted groups and then move from there. Banning JWs is the thin edge of the wedge, and other groups, who think they are safe, had better take stock because they're next.
Issues like the blood ban, shunning and other more harmful practices can be addressed via a range of other means, through exposure, law suits and other less draconian measures which do not need to issue from Big Brother.