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The balloon is unpowered, so I’m actually quite impressed that they managed to use the natural wind to make it fly over military bases precisely.
EDIT: By “unpowered” I was talking as an aviation term, which means the balloon is not primarily moved by a jet engine or a propeller. It may have propellers for course correction though as someone pointed out.
The power supply for the equipment is not what I was thinking about.
That's exactly right. I'm not sure what the pushback on this issue is? To me, it is plain and simple; they violated airspace, and could not retract the vehicle. Accident or not, it should be removed so it does not continue to violate the airspace. The move to wait for it over the water was to avoid collateral damage. 
I'm not sure what the controversy here is, aside from China crying foul. >

Theres no way you can spin it's presence in US airspace as accidental when the ground track plastered all over the news literally took it precisely over 2 US nuclear missile silo fields and Missouri where the B-2 is based.