They have had it coming for almost 30 years now.
Sources:
http://www.rferl.org/featuresarticle/2005/04/af8904ce-0073-4cf4-bb19-aad2401673d3.html
http://terrorism.about.com/b/2007/01/27/iran-playing-afghan-sandbox-while-us-media-attention-is-focused-on-iran-in-iraq.htm