i'd think we would want to know as soon as possible, so we could at least attempt to prepare militarily. Remember the fates of all those tribes that met peoples with superior technology.
Their fates were not determined by the other's superior technology but rather by the other's inferior social values that now, at last, we know are horrendous.
There is, of course, the fact that the Native Americans maintained a closed-borders against the rest of the world (With thriving cities), until herpes andor smallpox was inevitably transferred among the population. There isn't much that a military presence can do for that though.
