The first stage in a technology's advance is that it'll fall below a critical price. After it falls below a critical price, it will tend, if it's successful, to rise above a critical mass, a penetration. ↗
Maybe it's legitimate criticism, though it can be hurtful. Maybe I haven't paid sufficient attention to the people with whom I would have a natural affinity as a liberal, and they feel let down by that. ↗
Creationist critics often charge that evolution cannot be tested, and therefore cannot be viewed as a properly scientific subject at all. This claim is rhetorical nonsense. ↗