We all know the standard possible reasons.
Military tech. Free energy. Greed. Power. Control. Religion.
But consider this:
A civilization technologically advanced enough for this kind of space travel would possibly also be advanced enough for anti-aging tech. Immortality.
If this is the case, imagine the societal collapse and uproar if people found out only a “select few” qualify. People would riot and fight for their lives. No wonder the elites would want to keep it a secret and pull out all the stops to do so.
And if this has been a secret for 80+ years, it would also explain why we seem to perpetuate a system whose creators have supposedly long since passed. Why we keep repeating history. Perhaps they haven’t passed at all.
Curious what you all think.