Let's face it, the Quran burners were not some high school kids who did not know of the consequence of doing so in a country like Afghanistan.
This was intentional incitement of riots and has resulted in such, lives have been lost - more Afghan than American, and the American president yet again shields Americans from prosecution by foreign law, when the crime has been committed against a foreign country (we all know Raymond Davis saw no prosecution in the US).
Americans are in this region only to create trouble, I'm glad Afghanistan is realizing to this undeniable fact and the sooner we both realize this and work together with one goal - kick America out - the sooner we will move towards resolution of mutual affairs and prosper.
The test of American seriousness with Afghanistan would be if they hand over the culprits to face Afghan law or not. Will Afghanistan sit and watch as they abuse their system like they have in Pakistan?