Could we assume that a civilization advanced enough to travel vast distances would be able to stop anything we could throw at them. If they have been 'observing' us any length of time they would know how paranoid we are and not do anything to provoke us. If they are an aggressive race we would have already been defeated.

In my lowly opinion, not worth much in the grand scheme of things. IF there are 'Aliens' about, we should be safe from them and them from us.

Unless we are only seeing the scout ships and the Conquest fleet is still enroute. In that case I welcome our new Alien Overlords.

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"If they put me on a postage stamp tell them to use the young Bender"
--Bender