I am concerned about the history of humanity and where we are going. I agree that ideologies are a problem in the sense that they are ideas involving political agendas, reinforced by the mass media. You say that you don't think that, "human nature is a fundamental part of philosophy' and I do think that philosophy is beginning to abandon some of the basic questions about human living.
Personally, in my own studies and personal life I have been interested in ethics, including Kant originally, which was why I replied to your thread on the categorical imperative. However, I do believe that ethics based on intention rather than consequences is limited.
I have read one book which has influenced my thinking in particular, called, Depth Psychology and a New Ethic, by Erich Neumann. The copy I have was published in 1990, and I believe the original edition was 1949, but it is an accepted classic discussion about ethics, influenced by the ideas of Carl Jung.
In the foreword to this book, James Yandell offers a definition of human nature which includes, 'in potential form, capacities for such virtues as loving generosity, compassion, altruism, courage, patience and wisdom. It also includes potentials for other qualities, like callous selfishness, greed, envy, backwardness, cruelty, pettiness, destructive violence, and wilful unconsciousness.'
Neumann argues that the problem with traditional ethics is that there was an emphasis on perfection and this could not be achieved, meaning that people failed. Rather than people being given or trying to achieve a certain set of ideals the better option is for people individually to gain wholeness.
He argues that,'The mortal peril which confronts modern man is that he may be collectivised by the pressure of the forces of the unconscious,' and that, 'growth through wholeness necessarily involves a creative relationship between the dark instincts of man's nature and the light side represented by the consciousness mind.' So, the whole emphasis is about greater self awareness of their 'good' and 'bad' tendencies rather than be driven by them on an unconscious level.
The whole perspective of Neumann is so different from Kant in the sense that it is about understanding of our basic nature, rather than the importance of 'duty' as part of the moral life. But, the level of the quest is about self knowledge and Neumann stresses that it has, 'nothing in common with any megalomaniac condition of being "beyond good and evil"'.
I do not know if the ideas of Neumann which I have tried to give in summary will offer any useful way for considering the whole issue of human nature and the future of humanity and hope that you do not see the perspective itself as a dangerous ideology. I certainly believe that the best hope for us is increased self knowledge and this will determine our actions individually but in doing so, this can have an influence on the collective level too.
Of course, what I have been saying is that we need to understand our own nature on an individual level. This is a psychological journey and we are all unique and it is a picture which does involve a view of the person, involving unconscious as well as a conscious ego. So, it is open to philosophical debate.