Sure - Ebola COULD be used by rogue elements in a terrorist action! But, compared to many other infectious agents like even the common cold, flu, measles, pertussis or mumps, it wouldn't be very efficient in transmission. You need agents that can be easily spread via micro-droplets in an aerosol distribution - one that can survive for many hours and float on the wind. Ebola is only spread via larger droplet transmission that cannot float in the air. The ideal agent is one that can sporulate! Anthrax qualifies as the spores can dry and survive for a very long time. Dried spores can be spread quite efficiently as a bio-weapons agent. This is why every military member gets the Anthrax vaccination! Before someone accuses me of being a "shill" for the evil bio-weapons industry (which doesn't exist!), this is knowledge gained in a lower division medical microbiology college course.