Are you saying that God allows evil to happen because He is sadistic? That He enjoys seeing people crushed? Isaiah HIMSELF disagrees with that
"And the Lord shall strike Egypt with a scourge, and shall heal it, and they shall return to the Lord, and he shall be pacified towards them, and heal them." (Is 19:22)
And Ezekiel:
"But if the wicked do penance for all his sins which he hath committed, and keep all my commandments, and do judgment, and justice, living he shall live, and shall not die. I will not remember all his iniquities that he hath done: in his justice which he hath wrought, he shall live. Is it my will that a sinner should die, saith the Lord God, and not that he should be converted from his ways, and live? But if the just man turn himself away from his justice, and do iniquity according to all the abominations which the wicked man useth to work, shall he live? all his justices which he hath done, shall not be remembered. In the prevarication, by which he hath prevaricated, and in his sin, which he hath committed, in them he shall die. (Ez 18:21-24)
Forget about "once-saved always-saved"...
God is "pleased" to discipline us because He knows a greater good will come from it. God disciplines those whom He loves - which includes all men. Unfortunately, all men do not take well to discipline...It is a monstrous idea you have of God, if I am reading you correctly. God allows evil to occur for a greater good to come from it. God does not desire that a man reject Him.
Regards