Dialectical Materialism

• http://www.marxist.com/what-is-marxism-economics-materialism.htm#dialecticalmaterialism
• https://en.wikipedia.org/wiki/Dialectical_materialism

Is the basic concept that survival determines how we act? Why don't these theories talk about it? It seems.the problem lies in monism - the theory fails to address psychology, will, spirituality. Once again, disintegrative, doomed to confuse from the start?