An enraged man uses a vehicle to crash into a crowd at Berlin Pride festival

 https://www.reuters.com/world/berlin-pride-parade-called-off-after-car-hits-crowds-police-say-2026-07-25/ 

Unfortunately, almost any enraged person can crash into a crowd of people. 

https://abcnews.com/International/berlin-police-seek-21-year-after-vehicle-crashes/story?id=135095525 

Having a bunch of temporary safety crash barriers in place can make a huge difference.