Your analogy is fatally flawed. First of all, Marxism was only 150 years old before it failed in the USSR; secondly, Russians had an intrinsic desire to live.
Islamism is 1,400 years old. Even though it's a proven failure, it keeps on ticking, primarily because practicing Muslims believe a future paradise awaits them.
The only way to defeat the Muzzies is to either convert them or kill them.
That would be one bloody war. No thanks. The U.S. was founded on freedom of religion. How the Koran and Hadith is interpreted, and how Islam is practiced d is open to suasion by demonstration, persuasion, and coercion. That's how we'll win the War on Terrorism: Not by killing or foreceably converting a billion Muslims.