Aliens are not ignoring us, they just haven’t determined our exact location. When they do ... well think of it this way:
1) All civilizations must survive, but resources are finite;
2) All civilization must expand;
2a) Technological explosion;
2b) Certainty of suspicion.
All civilizations are predatory;
a civilization is either the predator or the prey;
prey does not survive;
predators who reveal their location do not survive.
We have reveled our location ...
We have reveled our location ...
correction:
We have revealed our location ...
I disagree with pretty much every bullet point you listed. China has been a civilization continuously for 5000 years and their borders are essentially unchanged. Not every life form is going to develop technology, as their existence may be based on senses that we do not even possess. The number and composition of atoms on each planet are essentially unchanged. Earth has supported lush life for millions of years, and has yet to have any resource strained yet. The “peak oil” argument continues to be proven wrong with every decade of continuous increase in proven and unproven reserves.