FM,
A syllogism reaches a conclusion. It does not pose a question. One of the valid forms is: All P are M. Some S are not M. Therefore, Some S are not P. In the terms of this discussion, All of Hashem’s creatures are recipients of Hashem’s goodness. Some people are not recipients of Hashem’s goodness. Therefor some people are not Hashem’s creatures. This, in fact, is the root of theological dualism.
You are √2 contends that being that the conclusion is incorrect something other than the major premise is incorrect, which is not logical. It is also not what √2 is contending. Rather √2 contends that we cannot know why Hashem created the world and thus sidesteps the question.
However, the answer is that we do not know what is ultimate good. For example, if a rasha dies young he does not further dirty his soul. It may even be an atonement. Moreover, if a person dies before his time because of some decree on the public or misuse of free choice he might get another chance by coming back.