First, I was under the impression that Jack had been disbarred, and now needed to have someone else take his cases to court for him because they were sick of his nonsense. That may have only been in one state though.
Second: The easiest way to train for such a plan would be to watch the news after one of these shootings. Every news station will have specials on:
A)What was done and how, to include how the guns were obtained and brought into the school.
B)How emergency services could have responded better and will change to face similar challenges in the future should the need arise.
C)Special coverage for the grieving of the families, the confusion of the survivors, and the trials of the shooters, proving once and for all that this act will get you noticed.
You can get all of this by watching public news broadcasts. furthermore, you cannot learn how to fire a weapon with any reasonable degree of accuracy from any game. If the reverse was true the armed forces would use this as opposed to live-fire training, as the game would be much cheaper to obtain and maintain than replacing thousands of rounds of ammo and paying for weapons matinence. At absolute worst, it can desensitize us to violence, but any violent media does so and no other media falls under such harsh scrutiny.
Last point: Correlation does not imply causation. Of course these kids played violent games, they were violent people.I'm curious as to whether or not there's a correlation between number of violent games sold and crime rates. I'd almost be willing to bet that it'd be negative, on account of criminals staying in to beat the last level of COD4 or somesuch.