God plainly told man that if he sinned he would die.

If thereafter he put him into eternal torment, then he increased the penalty after man had violated the law, and this is contrary to every principle of justice.

All of Adam's children were born imperfect.

"There is none that doeth good, no, not one," (Psalm 14:3) Every child is born imperfect.

It would be very unjust for Jehovah to permit such a one to be born under conditions over which he had no control and then, because he could not obey perfectly, to put him into eternal torture.