No one was present or injured at the office, a state Democratic Party spokesperson said. Tempe police said they are investigating the incident as a property crime.
I feel it's's almost certainly retaliation for perceived wrongs. What it accomplishes will depend on the person. Some will see it as scare tactics, others as a warning, more as stupidity, and others besides.
Intent, mostly. Other than that, not much. Because we can only assume why, even if it's easy enough to come up with answers, it's best to not leap to conclusions. I might be missing info though .
I guess I don't see the difference. If you are warning someone with a gun, the warning is that they willl use the gun. Legally that might not always be "terrorism" but the effect is the same so seems like we call it what it is.