Destroying Agency

...compulsion and force are used today by tyrants seeking power over nations and by political activists who seek to limit religious freedom and compel society to accept sinful behavior. The Lord has specifically condemned the exercise of “control or dominion or compulsion upon the souls of the children of men, in any degree of unrighteousness” (D&C 121:37).

However, the Lord also explained that power and influence can be used to encourage righteousness by loving persuasion, righteous reproof, and appropriate consequences (see D&C 121:41–43). This important clarification shows that carrying out proper Church and parental discipline, enforcing rules and standards in missions and Church schools, and establishing righteous laws in society are all practices approved of the Lord and not part of “Satan’s plan.” Honoring agency does not mean embracing anarchy.

The second possibility for how Satan proposed to save everyone is described in the Bible Dictionary: “Lucifer and his followers wanted salvation to come automatically to all who passed through mortality, without regard to individual preference, agency, or voluntary dedication” (“War in Heaven”). In other words, another interpretation is that Satan proposed to save us all, no matter what we did. This would destroy agency by rendering it useless. If consequences of our choices were all removed and everyone received the same reward, our choices become meaningless and our agency is destroyed.

Mark A. Mathews, "Satan's Rebellion," Ensign, Mar 2015, 68-69.