(a.) Only the people who have the wisdom could comprehend the philosophy. This perhaps is the reason why Buddha at the beginning, hesitated in preaching what he revealed. Dhamma Chakka Pavathna Sutra was eventually preached to five disciples (Pasvaga Mahanun) who held the Wisdom to listen and understood the Philosophy.
More over, Buddha never forced to accept what he preached out of respect for him. He expected listeners to analyze everything and accept if convinced true.
(b) During Buddha`s time, there were two main Yoga Systems in India
Atthakila Mathanu Yoga and
- Kamasukallikanu Yoga which were two extremisms that were diametrically opposing systems which Buddha rejected. In Buddhism, it is the Middle Path i.e. no extremism. This alone is an evidence why we must consider that Buddhism is neither Pessimistic nor Optimistic. It is only Realistic. Hence Buddhists must avoid talking only about Suffering. The Noble Eightfold Path do not talk about Suffering it talks only about the realities and ways to bring about Happiness to all living beings and avoid suffering.
(c) For those who do not have the required Wisdom, there is no choice but to stick to Rituals, Offering, Praying etc. to various forms of Gods etc. to bring about the Protection and Conservation that we bring at birth.
(d) Buddhism is not a religion because when we talk about life after death, we consider a creator, soul, day of judgment, hell , heaven and similar things. Life will not exist after death for those who attained Nibbana at the end of the cycle of birth death. Lord Buddha when born as Prince Siddhartha, said that was his last life. So are the others including Arahants who will not be reborn.
Therefore by definition as well in reality, Buddhism is not a Religion.
Also as Buddhists, we must not dwell in the past while lamenting over the bad deeds done. Also we must not dwell in the future too because that is a sure way for regrets and disappointments. We must live in the present and move on.
When analyzing the Buddha`s Noble Eight-Fold Path, it is clear that both pessimistic and optimistic views have no place. Only the Realistic Nature becomes prominent.