You make good points. But maybe situation would be different - they could be a paranoid race (maybe even for good reasons, based on previous experiences), or ra

You make good points. But maybe situation would be different - they could be a paranoid race (maybe even for good reasons, based on previous experiences), or race looking forward beyond next few thousand years. Planning/doing colonization of entire galaxy, at massive scale (ie insect-like). Resources are finite, room is also finite and other galaxies are ridiculously far for sub-light expansion. When cold hard logic is applied, even great ally will eventually turn into competing party, just a question of time. Its true that in that case Earth would be probably preemptively wiped out long ago since life markers are here for billions of years. Its fun mental exercise, just highlighting how we don't really have a clue, just wishes/fears and some (doubtful) statistical projections like Drake equation.