Gunman opens fire in an immigrant education center.

It's too early to speculate, so I'll speculate anyway.

Hostage shootings

The shooter, using the alias Jiverly Voong, lost his job recently at IBM. He's 42 and Vietnamese. How long ago he immigrated here I haven't read yet. But I imagine he's probably been here since the middle of the 1970s. It's a long enough separation between his immigration story, to his allow for a hatred of "The Other." Heck he probably blamed his job loss on outsourcing to India.

So he goes out and kills people that represented, for him, the people he hated.

That's my theory.