It could take a long time to answer that question, in the sense that there are probably many reasons.
I'll simply state it as this: the Ahmadiyya community really adheres to the concept that Islam means peace. Unfortunately, those Muslims who are creating this havoc are not following that concept of what Islam is. For whatever reason, those ideologies are setting in and it's creating hate towards the western world. If they were to go back to the root of Islam, these problems would not be there.