Brian Dunning evidently successfully debunks the 'Brazilian Roswell' Varginha UFO incident of 1996:
https://skeptoid.com/episodes/4853
As is typical of his MO, he casually lumps it together at the conclusion with the far from mundane 'Phoenix lights' mass sightings of 1997.
Having travelled millions of miles through space and for all intents, without incident, requires some serious guidance systems and other tech. Yet upon arrival we fly around a coffee plantation for couple days, eventually crashing. Talk about bad luck, long way to call for help and if you’re in a large group, no one’s coming to look for you.
But not all bad. Fortunately and against all odds you’re on a planet where you can just go out and wander around. Conditions are favourable and there’s no fear, despite what little microbes that eat/infect just about anything can do. Don’t even need a spacesuit but that would only get in the way should you encounter a mud puddle, something you can’t resist playing in. Another stroke of luck is to resemble the most intelligent creature on the planet because they’ll just whisk you away to safety. It’s ok, you’re not carrying a weapon anyway. It’s tough knowing how intelligent you have to be to get there but how powerless you are once you do. Somebody wasn’t thinking ahead.
I can think of an Earthly scenario where junior takes parent’s car without asking, goes for a joyride and ends up putting a few dents in it. That’s probably what happened in Brazilian incident….or similar. Aliens never thought of putting tracking devices on their vehicles just so they could retrieve it should it ever get lost. Any reports of the alien craft’s fate?
It's those kind of considerations that always made me skeptical of the Roswell 'saucer crash & parts/beings recovery' lore. What - no 'mother ship' nearby to mount a rapid response rescue mission? Such a careless and/or callous lot! Among various other improbabilities.
Such as 'eyewitness testimony' that didn't add up. One being Jesse Marcel's account of the 'super indestructible' properties of the metal pieces found:
https://www.youtube.com/watch?v=Qt0tBz0Hjuk
Funny that - wreckage scattered like tin foil scraps, over a very wide area, after a subsonic 'crash' (no sonic boom reported), yet also of super duper tough construction?! Have your cake or eat it - choose.