The conventional explanation is the strange lettering on the debris was manufactured in a toy factory!
http://www.csicop.org/si/9507/roswell.html
For me the strongest argument against the Roswell alien craft claims is that none of the eyewitnesses seem to have taken the trouble to document their observations back in 1947. So far as I know, we have no diaries or affidavits prepared at the same time as the supposedly shocking events. We have apparently sincere documents prepared 40 or 50 years later. These are obviously subject to the games that memory plays on all of us. However, I am sufficiently intrigued to read a couple of books on this subject, and then I will make up my mind.
The strange lettering was supposed to be Scotch tape with flowers used to afix aluminum foil to bulsa wood kite sticks. I had a meeting with Dr. Moore who was project manager of the Mogul Balloon and he showed me what they thought I had seen. It was not even close. :-)
I've seen that on one of the several UFO TV shows that fairly present both sides. It's because the all seeing, all knowing infallible government fascists kept them from scribing even the most threadbare of accounts.
It's interesting how the further away from the event, more and more people tell more and more vivid versions of the story.
Mostly, unsupported second and third first hand accounts, of course.
So far as I know, we have no diaries or affidavits prepared at the same time as the supposedly shocking events.
None released to the public, anyway.
Which is a pretty DIFFERENT thing from none existing at all.