More concerning are the capabilities of the craft. Lights don't mean anything or serve another purpose if these are alien devices (which hopefully they aren't).
Me personally, I'd need to hear the capabilities of these crafts to make a judgement. There are reports that they do things like drain batteries and "disappear" if you get close.
Then there's the whole practical thing. What's their power source to stay up there so long? Who gave them authorization because law makers raising hell? What are they doing violating the airspace of other countries? What are they doing around sensitive installations as well as residential areas?
The "move along, there's nothing to see here" people are just as bad as the conspiracy nuts...