That was my thinking. His disability got taken or he got fired and he went postal.
Color me a skeptic but I’m not buying the single shooter line. Target was a Christmas party, not such an illogical hit. And I can’t picture a single guy donning a vest, long gun, then have an escape route that works. Doesn’t follow.
Only problem with that theory is that this is Regional Center, NONE of these people make determinations for SDI, they simply provide services for them. So no revenge target there for denial; being fired? Having dealt with the local regional center for decades, I've yet to come across a more pacifist group. Their weapons are strongly worded memos, rarely.