Given that the people who benefit the most from a mass shooting are gun manufacturers and the NRA what do the Dems gain from staging this attack? Increasing gun sales? Making GOP governors arm teachers? I don't see how these shootings help Dems at all.
Oh and Hispanics leaning conservative isn't a new thing. Alot of them are Christian after all, and more devote then most so called fundimentalists. Really the only reason more Hispanics don't vote Republican is they are not idiots and can see that the GOP has been demonizing them for years. If the GOP wants to win over Hispanics try actually appealing to them.