Islam “dictates” that all Muslims (Meaning Muslim men) emulate Mohammad and do “exactly” as he did and since Mohammad was a brutal uncompromising War Lord that practiced Jihad (war) that is what they do to this day. Their goal as was Mohammad’s goal was to rid the world of all other forms of living and make everyone a Muslim or kill or enslave them. There can “never” be peace between a Muslim and anyone else (the Kafir) and anyone who thinks otherwise is a fool. There is no such thing as radical Islam, Islam is Islam just as ISIS practices it.