Barbecan Secure Entrance Systems would have prevented many prominent attacks, for example:

Prominent Active Shooter Events in the US

Nation Date Location Killed Injured
Unites States August 4, 2019 Dayton, OH 10 27
United States August 3, 2019 El Paso, TX 22 24
United States May 31, 2019 Virginia Beach 13 4
United States May 18, 2018 Santa Fe, TX 10 13
United States Feb 14, 2018 Parkland, FL 17 14
United States Sep 16, 2013 Washington Navy Yard shooting 12 3
United States Dec 14, 2012 Newtown, CT – Sandy Hook 28 2
United States Jul 20, 2012 Aurora, CO – Theatre Shooting 12 70
United States Apr 16, 2007 Virginia Tech – Blacksburg, VA 33 17
United States Apr 20, 1999 Littleton, Colorado – Columbine 15 21

 

Prominent Terrorist Attacks with coverage in the US Press

Nation Date Location Killed Injured
Russia Apr 3, 2017 St. Petersburg Metro 10+ 43+
United States Jun 12, 2016 Orlando Night Club 49 53
Belgium Mar 22, 2016 Brussels airport and metro bombings 35 300
United States Dec 2, 2015 San Bernardino 14 22
France Nov 13, 2015 Paris Attacks – Bataclan theatre 137 368
France Jan 2015 Charlie Hebdo – Paris 17 22
Russia Jan 24, 2011 Domodedovo Apt, Moscow, Russia 37 173
Russia Mar 29, 2010 Moscow Metro bombings 40 102
United States Nov 5, 2009 Fort Hood shooting 13 33
India Nov 26, 2008 Mumbai gun and bomb attacks 166+ 308+
United Kingdom Jul 7, 2005 Underground bombings in London. 53 700+
Russia Feb 6, 2004 Moscow Metro bombing. 41 102+
Russia Oct 23, 2002 Moscow theater attack 170 700+

Worldwide Attacks by Islamist Terrorists since 1980:

Killed –> 17,271 | Injured –> 41,478

Source: Wikipedia