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If someone already said this, forgive me (102 letters are tough to read through, I did some skimming), but as far as the "domestic dispute" goes: at first the cops thought that it was a MURDER/SUICIDE. When they didn't find a gun, then they went on to looking for the gunman, who they apparently thought had left the campus.
I think that assuming nobody cared about a "domestic dispute" is naive and somewhat beside the point. In this case, they thought initially that they had the whole situation. And if it had been a murder/suicide, locking down the campus wouldn't have made any sense at all.
Blame the school, blame the liberals (gun control), blame the NRA, blame the victims. Watching people balance their politics on the backs of 30 dead teenagers is an ugly sight.