Why difficult to believe?

“Before the multitude they seem possessed of the three poisons or manifest the signs of distorted views. My disciples in this manner use expedient means to save living beings.” -- Lotus Sutra Chapter 8

"Now, in the Latter Day of the Law, though the teaching, the people’s capacity, and the time for propagation are in accord, we must expect all the more hostility. For this is the age when quarrels and disputes prevail, and the pure Law is obscured and lost.1 Moreover, the teacher is but an ordinary practitioner, and his disciples come from among evil people defiled by the three poisons. For this reason, people shun the good teacher and associate with evil teachers." - Nichiren