To argue that existence as such is a good is not to say that it is the highest good. This opens the question of when the existence of the individual must give way to some other good. This is not the same thing as to say that, if it must give way, that continued existence is evil, though this seems strongly suggested.
Existence is for the sake of operation and the whole is greater than the part. Is it then evil to cling to existence in the face of debilitated operation or in the face of the demands of the whole of which you are a part? As both existence and operation are of the individual, the question is to what extent the individual is ranged under teh whole, and what will count as the whole.