Re: Anyone else think they should have left the Borg well enough alone If you're talking about 'why didn't the borg travelled into the past in the Delta Quadrant and then assimilate 21st century Earth with no problems' - this is hardly a plot hole; indeed, it's easily explained satisfactorily. It's obvious the borg's A plan was to assimilate 24th century Earth; and, as the movie showed, they had a very good chance of doing just that. Travelling into the past was the B plan - and for obvious reasons; instead of assimilating advanced 24th century humanity, they would assimilate some rag-tag communities, remnants of a primitive society that was just ravaged by a catastrophic war. As assimilation targets go, 21st century humanity's value would be beneath the kazon - which were too uninteresting/lame to be an assimilation target - if not for humanity's future proeminence. Which is most likely why the borg don't employ routinely time travel into the past. This strategy would severely decrease the value of any assimilation target, each time it would be employed. And, of course, any 'time travel into the past' mission is likely to change the future borg that sent the mission - for someone which believs itself to be perfect, that would be another BIG reason NOT to do it.