The most likely answer is that the victims should not be able to sue the manufacturer of a violent game for a design effect. This is because it is difficult to establish a direct connection between the video game and the mass shooting. It is likely that thousands, or even millions of other people have played the game constantly and have not developed these tendencies. Moreover, even if the tendencies were developed, this would not mean that the thoughts would develop into action. Thefore, it is unlikely that the manufacturer would be considered liable.
