If you look around the world, all religion is becoming very polarized. Society is evolving, and some religions, (like the RC church), are slowly beginning to evolve with society progressively, (I am an atheist, so not defending the RC, although the modern version of the RC is quite docile), while the more fundamentalist ones, (radical Islam, Evangelical Protestant, JW, Orthodox Judaism, etc.), are becoming more extreme and out of touch with the rest of society.
A positive feedback loop is what we are seeing. As society evolves, (and this is happening much faster with the aid of modern technology), more people are becoming less religious. The fundamentalist type religions are responding to this with varying levels of extremism, pushing the moderates either away from religion entirely, or they become extreme themselves. What is left religiously is even more extreme, and this further pushes existing moderates out, etc. This is not a stable situation and will become unhinged for many religious groups in the coming years, not just JW.
d4g