How about raiding American shipping and either slaughtering or enslaving every one on board.
The Barbary Pirates, muslim btw, were quite happy to behead, rape, pillage, and cause what would be hundreds of millions of dollars in economic damage in todays dollars.
Read up on them. They were every bit as bad as what we're facing today.
L
They lacked the means or potential to create the destruction of society or at least murder as many people as they can today.
Islam itself has not changed which is something we both agree on.