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It's possible that the crafts are not designed for the earth environment and that it is different enough from expected environments that there's some ways for these to crash. For example, they may not be able to handle earth storms, longer term exposure to microbe-containing rain or random bird collisions.

We humans have crashed plenty of advanced craft on Mars. Does it mean it is not possible for us to travel long distances?

If you define the veracity of such claims as facetious, consider the early experiments of Enrique Inglesias Fermi when he invented microwaves. No one disregards the book GWB was reading to that class on 9/11/21 and no one would because it was on camera. Please take care with your words as many here look up to you guys for explanations to the larger UCF topic. Thanks!

Maybe it's an alien weather ship :P