Either way, I think thinking about the perpetrator's motives is ultimately irrelevant. Whatever it was, it doesn't justify what they did to the studio, nor to the families that are grieving for the loss of their loved ones. Useless to talk about it, and pretty insulting to those that have died.
Prayers out for those suffering from loss.
If you ever want to help them monetarily too, you can opt to buy from their online shop instead so that they directly receive the money. It would be helpful if you buy products that do not need packaging as well to not burden their employees with the work. This guy lays out the process for doing it.