Otherwise, his activity would be less strong and less successful. Many lamas, not Kagyus but from other lineages, say at the moment, that we should not go back to Rumtek even if we could. Even if we went, we couldn't undertake anything without many preparations. Without preparations, it would be as if Karmapa was behind a wall of obscurations from broken samayas. We have to prepare ourselves in the right way.
All teachings emphasize the importance of preparations.
That is why we do Ngondro, Guru Yoga, and so on. Without the right preparations nothing happens. My perception is that people without trust have nothing at all. But blind faith alone doesn't lead to anything because you have to search for the why and the how intellectually in order to get results. Also in Buddha's time, there were people who had no trust in him and there were people who noticed his qualities immediately and followed him.