Tech can be used for good or bad. Military tech is no exception. It is used for good when people are being protected and assisted. Maybe drones could be used to try to find citizens that are lost and hurt in a park and then shoot a flare and respond with GPS coordinates to assist in the rescue mission. But, hurting and killing people, regardless of who they are, is bad.
But, by the same token, things don't have to be technologically advanced and inhuman like drones to be evil. Roadside bombs are the perfect example. What the fuck good is a roadside bomb, really? Or terrorism in general for that matter? Whether you are remotely flying a drone or having someone fly a plan into a building, you are killing people in either case.