Randomly...hmmm nope I agree with SteveLaw, most homocide is not random it is motivated. Terrorism is motivated, people who snap tend to target the people who made them snap.
Random stuff is rare and the realm of true phsychopathic/sociopathic behaviour. The majority of random killings are probably accidental.
Terrorism is motivated towards a government but carried out against its people. Anger spree killings, there's usually innocent people caught in the crossfire, so while they may be motivated they can seem random to the people hurt in them.
It's likely that the attacker of the op, had a motivation. We just don't know what it was. Do you think terrorists announce their motivations before an attack? "Attention everyone, we have a problem with your government, so we are going to kill you now. Any questions? No, ok here goes, bye bye".
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