Why hasn't some game developer made an Open world GTA style game based on all the London stabbings/gang activity?
If done right it would be a tripple A title for sure
You start off as a new recruit being initiated into a gang and during the course of the game you work yourself up the ranks and gain notoriety
You can buy body armour, and zombie knife's ..etc, and you earn money from drug dealing and robbing "food" from other gang members [Top Boy style]
You go to war and have defend your patches from rival gang members, even set honey traps to pick off certain individuals ..all the time trying to stay one step ahead of the feds
Seriously, the game would sell.