The Betelgeuse colony expedition consisted of hundreds of literal starships.  They were Slower-Than-Light ships of course, but in other ways were actually far more advanced than our scout.  Luckily for all of us we each had First Contact procedures, us because we knew there were other races, and they because they thought there might be.  Unluckily for us, they never expected Contact to happen in the middle of their own home system.  They got real twitchy real fast.