Satan obviously had a very compelling argument in the War in Heaven. It was compelling enough that one-third of all Heavenly Father's children took his side. What was it about Satan's plan that made it so compelling? One reason was it guaranteed a type of salvation to every person. Each person would be compelled to choose the right, and would thereby gain eternal life.
Today the battleground has changed, but we still see the same war. The freedom to choose is still an important piece of the battle. Thankfully in many countries today, the freedom to choose what one believes is legal. That religious freedom came at a very high cost. Let's hope and pray that religious freedom will continue to spread to all countries of the world.