A state of lack of thoughts of the Creator is regarded as a curse. But evil thoughts (thoughts that oppose the Creator) are not considered a curse, because they still maintain contact with the Creator, a situation that is better than not having any contact with Him.
The purpose of Kabbalah (Heb. Reception), which is only giving, is opposite to those who think only of themselves. As a result of that, all the terms of Kabbalah bear an opposite meaning to the ones we have in this world. We tend to materialize spiritual concepts and relate them to ourselves. Thus, we interpret the curse as something that goes against us and not against the Creator.
Courtesy of http://www.youtube.com/watch?v=wsqKH_VIrng