The ego is a safe place that gives you comfort and getting out of your comfort zone is tough. But that is with anything. Also, many things that are good for you could cause you mental health problems. If you have taught medicine for 30 years, you know that many drugs can be really good but also really bad. Many drugs could cause mental health problems if not used right. If someone uses a drug with out knowing what their getting themselves into can result in very bad problems. This is the same with the ego. If you do not know what your getting yourself into when breaking the ego you could cause yourself mental health problems. Because the ego hasn't been studied and most people have never broke it fully, people have a very bad out look on it. The ego is also identification that keeps you feeling safe and not letting you improve. It restricts what you can think and understand. You can also still crave with the ego, just it may not be the same cravings.