In the Hereafter, there will be a lot of arguing with Satan. Many people would justify their sinful acts as a result of being deluded by Satan.
Furthermore, some people considered Satan as being responsible for their sins and that he was their controller.
In short, all sinners blamed Satan. Hence, this idea had to be changed. To do so, Satan himself had to speak and defend himself so he said, "Verily, Allah promised you a promise of truth. And I too promised you, but I betrayed you. I had no authority over you except that I called you, so you responded to me. So blame me not, but blame yourselves. I cannot help you,
nor can you help me. I deny your former act in associating me (Satan) as a partner with Allah (by obeying me in the life of the world)."
This was Satan's declaration ......
Although by nature there was hatred inside human beings for Satan and although he was the enemy of mankind, yet Satan's declaration appeared to be most reasonable. Satan denied that he had the ability to force the human race to sin. He refused the notion that he had any power over mankind. He argued that he only seduced, suggested and ornamented unlawful deeds to humans.
In other words, Satan used to suggest but it was mankind who considered and applied the unlawful acts in different forms. Thus those who blamed Satan and accused him of being
responsible for their sinful acts were merely evading responsibility.
Actually, at first, Satan was an affliction to Adam, then to mankind as a whole. Satan was not able to force man to commit sins. So if man sinned then he would be responsible for submitting himself to Satan.
Such submission was not justified, so man would be responsible for his own actions.