There is a difference. The Soviets did not believe they would go to heaven if they set off suicide bombs in shopping malls. The Islamists do. Treating the Islamists as a rational enemy is your first mistake.
Your second mistake is to believe that there was any such thing as "containment". Nonsense. Proxy wars were fought all over the globe during the Cold War, in places like Angola and Afghanistan.
Finally, just by "leaving the Islamists alone", you will not get them to leave you alone. These people will regard that as a sign of weakness. Second, they hate what America represents as it is a counterpoint to all they believe in. There is no way to simply "avoid" the terrorism. It is just like with that other rabid madman Hitler, evil has to be hunted down where it lives and thoroughly destroyed.
I'm sorry you don't have the stomach for this, but that's the truth. You can either deal with it or not, but it remains the truth.
Ivan
Yes, it is doomed, but there are very major differences. The Marxists did not want to die. That is why containment and fear of retaliation worked with them.
These fanatics do want to die. And they want to take as many of us with them as they can. Neither containment nor threats of retaliation will work with them.
Take a look at what Isreal is going through.
Becki