We are people, and people have a specific nature, a predictable way of acting as individuals and as a species in general. Certain key attributes define our personalities and our humanity. We all laugh, we all cry, and one thing is for sure—we hate change. People will often continue actions that they know to be irrational long after they know they should change.
There is a plausible rationale for this attribute. In our distant past, change was not a good thing. It created risk, and our ancestors could easily become dinner for a snarling beast if they weren't careful. Knowing what to expect was crucial to survival. Surprises rarely turned out for the best in that world.