On recent events and their designation "Terrorism"

Terrorism is "the use of violence and intimidation in the pursuit of political aims."
These days, I worry that we misuse the term. A killing spree caused by anger against the world isn't terrorism - it's mass murder. And mass murder is just as bad as terrorism - both take life, and both do harm to our communities, families, selves. The recent Colorado Springs shooting and San Bernardino massacre are both important data points in the ongoing struggle against mass killings in the United States.
However, I don't think we should call either "terrorism" at this point.
The added dynamic of terrorism is that someone is doing it to cause a political reaction, or to change the behavior of a population. The targets of terrorism are not the direct victims of gunfire - they are us, the "everyone else" who might have been at that store, or at that party. Even if the shootings in recent events were motivated by political statements, that doesn't make them terrorism because they weren't going after our minds.
Now, should the non-designation change our response?
I would say no. The designation of terrorism is tactical - it calls us to be on guard against manipulation of society through violence. For example, the recent suspicions of Syrian refugees after the Paris attacks (committed by people who were neither Syrian nor refugees, but who apparently carried a passport from a refugee to ruse us) was a successful result of that terrorist action. A public murder, such as the killing of a reporter and cameraman in Virginia, may not have those same attempted manipulations, but it demands our response just like any act of terrorism.
The DC Sniper Attacks are my counter-example - they were committed over a period of days with the goal of terrorizing a population to "shut things down" in the United States. The clear targets were not the random victims (known to the killers in 2/3 cases above), but instead the rest of us. That did demand a calculated response - taking all actions to catch the murderers, and knowing that they sought to create fear and therefore taking counter actions (like putting more police in schools).
The words we use to label things matter. Let's not muddy the waters of "terrorism" by assigning it to every killing with a political connection.

EDIT on 1/3/16:

Now we have some militiamen in Oregon occupying a Federal building and a lot of questions about if this action is "Terrorism." While it matches my dictionary definition, I don't think they occupation is being done to scare other Americans or (and I don't see a threat that anyone will be taken hostage). They also aren't doing this to change the original prison sentences - the Hammond family doesn't welcome this occupation. I'm still struggling, though, to create a clear definition.

The political stance these people are taking seems to be "it is the right of the people to occupy an empty federal building."

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