For me it was a few things plus the way I was treated by this "loving organisation" when I was ill and in need of support.
But changes based upon the "light gets brighter" fallacy never made sense to me. Because what WT does is blow out the old flame and introduce a new one. So the light stays as one light. Later on it too will be blown out and replaced with another leaving with the same amount of light. Except for the personal realisation (💡lightbulb moment?) that for all of this new light, they are all in darkness really.