It has already been stated that we are all human and mistakes will happen. This is business though, it is not personal. You spent a lot of money on your new Honda and it is reasonable to expect professional service from a dealership mechanic. I would make sure that you obtain a signed document stating that the dealership will be responsible for any engine issues going forward. An extended warranty was mentioned in a few of the posts on this thread. I would expect for the dealer to provide a warranty extension at a minimum. I would also notify Honda of America about what happened. You want to have your documentation in order and making Honda aware of what happened is not at all vindictive. What if your dealership closes? Honda of America wants people to feel comfortable using dealership service centers and they should bend over backwards to put your mind at east.
On a side note, I once bought a new 1998 CR-V for my wife. Since the first oil change was free, I took it back to the dealership at ~4,500 miles. When I got home, I raised the hod and found that the technician that had worked on my wife's CR-V had spill oil all over the valve cover. To make matters worse the level on the dipstick was ~3/4" above the full mark. I immediately took it back and told them I was not at all happy. This was no way to treat a brand new $20,000 vehicle. They made it right, but I quickly learned my lesson and have performed every oil and ATF drain/fill since that day. I just don't care to roll the dice and hope that some guy making about $8.50/hour will do a proper job.