As early as Treta Yug, asurs have tried to disrupt creation. Disruption of creation is inevitable. Mahapralay is a natural follow through of creation and asurshave an important role to play in it. Without the asurs, mahapralay cannot happen and a new beginning cannot be made.
Everything in creation is cyclical, nothing is linear. There is childbirth and death and rebirth. Sun rises and sets to rise again. Seed gives rise to tree which produces more seeds for more trees. Moon follows a cycle, as does water. The cyclical pattern is seen in human evolution too. Lighter thoughts, thoughts for creation and selfless actions make one rise and heavier thoughts, asuric disposition put one on the descending cycle.
There is a limit to how much you can rise or fall, and that depends on influence asurs and devas in your life. Ravan, for example, ascended to be one of the greatest pandits of all times who extemporaneously created the Shiv Tandav Stotram, to perfection which calls for sadhna of many years together. Ravan could do that owing to influence of devik shaktis on him. But as asuric shaktis took over, he started disturbing the rishis and munis, and so his descent began.
Saffron has been worn by rishis and munis since thousands of years and since thousands of years it has been attacked by the asurs. We all know of Lord Ram who went to defend the yagya of Rishi Vishvamitra against the attack of asurs. Yagyas create positivity and asurs thrive on negativity.