Tip of the Iceberg Walking through Indianapolis, you can see uniformed police officers directing cars and pedestrians at every major intersection.  These officers account for roughly 10% of the security at this event. The other 90% you will never see. This is, of course, by design to keep fans thinking about enjoying themselves and spending money and not thinking about the major target this event is for groups of people trying to garner publicity for their message. Homegrown and international terrorist groups look for high profile public events they can disrupt to gain attention for their cause. They need not cause mass casualties to be effective; simply scaring the public is likely enough.