Devildoc
Verified Military
You can also be just batshit crazy and a motive is never truly known, if one existed in the first place. We may never know why this guy did it, BUT it is easy to speculate. Previous high profile shootings either had fabricated info or info withheld. The FBI is running the investigation and Kash Money has proven to be anything but honest, so do we trust their press releases?
I also like @Florida173's woman angle because that one's very plausible.
Meh.
There was also a shooting (8 shot/3 killed) in North Carolina, at a coastal town, from a boat into a bar/restaurant. Also a Marine, his social media shows someone who was batshit crazy with mental illness and TBI.