No one will prolly see this bu I will write it anyways.
Take your class two civilization, and lets add a religion to it, that would change your entire argument, because of the posibilities of what they
could or couldn't do would be based on a religious belief.
Now these are the factors that are never brought up when these types of things are discussed.
The OP is weak, and flawed. Although i do like his validation of the resources are neutral to un-valuable to them.
Here is a few things not considered in the OP
-If the aliens have a religion that counters our validity as beings, (i.e. we are viewed as heathens or barbarians or simple animal because we don't
follow their faith)
-to destroy the human race wouldn't cause so much destruction, first EMP's would be used to disable the electronics, then specific biological weapon
would be deployed that could be us to kill all human and human like DNA chains. and Boom there goes the dynamite. (they area class two civilization
lets not forget.
-what if they did come here in peace, then the governments of the world (I am looking at you US) disrespected,
lied too or even threatened them.
-this is more of an add to the last one, what if a craft of thiers crashed on earth, then the governments holding the crew as hostage or prisoner, and
wouldn't return them to their own people. Maybe they even already autopsied them, perhaps even while they were still alive, and then their bodies were
disposed of in a disrespectful manner to their culture.
-what if there is a combination of resources here, that when combined correctly creates that magic fuel you were talking about, we just haven't
figured out how to do that yet. That might make them interested.
-Let's try something simpler, what if they just don't like us.
I could go on and on and on...
edit on 25-4-2012 by KingAtlas because: clarity