On the last point you talked about, “prove it definitely will become such a future”. You simply cannot prove that without going there. What we’re seeing is not a natural course of actions, so we cannot simply derive the consequences like we would be able in science. Even in science, often times, the best we can do is probabilistic. The best we can do is show that such a future is possible, and that given the evidences, we may be able to conclude that the chances of realizing such a future is so and so, with caveats to known unknowns and unknown unknowns.