No, but the shooter did refer to both of them as inspirations.
thank you for having the balls to agree that neither was an organizer
I'll give you a more applicable example.
Is a concert promoter legally responsible for a fight that breaks out at his concert?
certainly
Crowds, Violence, and Tort Liability
Crowds, Violence, and Tort Liability
you might also want to look up
the theory of concert of action in tort law
you will see it in both civil and criminal law
You might want to read that link a little closer.
I was specific in my wording for the example - a concert promoter does not own the venue of a concert, and has no obligation towards maintaining the security there. That responsibility lies with the owner of the venue - or in the case of a protest, the city the protest is being held in.
concert promoters get sued all the time
On May 25, a shooting at a T.I. concert in New York City left one person dead and three others wounded.
Troy Ave affiliate Banga died from a gunshot wound to the chest. Ave, who was himself shot in the leg, was formally indicted for attempted murder and later sued NYC venue Irving Plaza and its operator Live Nation. He claimed that the venue’s lax security measures put him and others in danger and that the personnel at both Irving Plaza and Live Nation should have been more active in de-escalating the event.
Now two attendees injured at the concert are also suing the venue and Live Nation over inefficient security, reports TMZ.
The lawsuit claims that “the venue didn’t adequately screen people entering the concert,” which led to the shooting and that the plaintiffs “suffered serious physical injuries and mental anguish.”
Two people injured in the T.I. concert shooting this summer are suing Live Nation
Read your link again.
Irving Plaza and LiveNation are the owners of the venue, not the promoters of the concert.