Earlier quoted context omitted.
how is that different from any air strike?
It's not, but I doubt that the people complaining about drone strikes are perfectly OK with air strikes. Drones are the most visible and most rapidly expanding facet of the problem so it's not unreasonable to focus the discussion around them.
Turned around the problem with this argument is that it's solved by getting to know the people you are about to kill.
Which sounds rather silly if the point is to protest killing people at all.
Or if we stay focused on drones, just kill them with one of the other dozen remote methods we have at our disposal.