Good points, but putting things off as long as possible is often a good strategy.

Suppose the First Americans had slaughtered Columbus and his crew on the beach, and every explorer or conquestador thereafter, for some time, and used that time to contemplate, study and prepare for European contact with better understanding and insight into what it might mean for them? Suppose they had been able to bargain between Spain and England, for example? Might we be seeing an Aztec controlled Mexico today?

Human experience shows what happens whenever a truly inferior civilization comes into contact with a vastly superior one, very bad things happen to the inferior one. So how do we avoid or mitigate this?

Also, let's not make the same mistakes the Incas made in overestimating the Conquistadors. First Contact may well be followed shortly by Second Contact with somebody different, and Third Contact, etc. . .

Jeff