This would be reasonable if we could verify that we've been visited by tens of thousands of spacecraft, the odd one of which here and there has some kind of massive operational failure. But surely if they were that common we'd have all seen them by now, right? It's the bigfoot argument all over again and I see no logic to contradict it in either case, sadly.
Certainly agree with you. The problem is that the discussion is all theoretical, and we have no idea that IF aliens are coming to earth with advanced technology, that we would see them all the time. Maybe they are and we just don't know it, so it would be very hard to make the analogy that the ratio of crashed craft vs not crashed craft comparative to something like modern airliners.
Further, as things become more advanced, there is a prevailing possibility that they are more prone to failure. A Tesla is much more advanced than a Model T, but that doesn't mean that a Tesla isn't prone to failure/issues. Theoretically, if we talking about propulsion systems that defy all of our understanding of physics, by nature we have no idea how sophisticated they might be, and how prone to fail they are.
All I was originally saying was that the idea that UFOs crash, should not logically preclude them from existing, based on the theory that they and their technologies must be absolutely perfect. I grew up loving muscle cars and used to wrench on them all the time. Took a lot of persuasion by my wife to get me to drive around in a more current vehicle. You know why? Because I hated the idea of conveniences and luxuries - such as power windows or power seats - to me, it's easy to just crank down a window and why have something more complicated that is just prone to failure. Don't know why I told you that, but our conversation made me think of that - ie, just because something might be more technically advanced, does not make it free from failure or error, and in a lot of cases being more advanced can actually make it more prone to problems.
As to bigfoot, I don't profess to really know much about it - I've been exposed to stories from tribal elders about so called bigfoot type creatures, but to me that's all they were, just stories that were likely embellished over time as an oral tradition implies. That's not to say that I don't find them intriguing, but I've never really steeped myself in those stories.
Believe it or not, I largely agree with your criticisms. But some part of me enjoys talking about things of a more theoretical and philosophical nature, which is why perhaps I remain curious about subjects like the paranormal, UFOs, bigfoot, etc.