I don't expect to be told the truth either, but I also don't consider everything I know about anything as the absolute truth. There's some things I'm very informed in, and some things I just have an opinion about, and some things I can't even get information on.
For instance, talking conspiracies: I consider it entirely possible that 9/11 was somehow orchestrated by the US.
I don't know for sure, and I'm certain I'll never find out whether it's true or not, and I don't consider it to be the truth either, just a possibility. It doesn't really change anything to me anyway, whether it's true or not. I'm not a US citizen, this is their issue, I don't care.
My point is, if it's anything that by its nature doesn't provide enough information, you can never know for sure if it is true or not. You can only guess and theorize. And no matter how much I theorize, while I can consider the 9/11 conspiracy to be possible, I can't consider this NASA conspiracy to be possible. The information I have and my own brain processes just tell me that it doesn't work out.
PS: Videos being taken down don't matter on the internet. Like I said, a few minutes are an eternity there, and if the subject is controversial and it's an important subject (which this certainly qualifies as), the video gets copied and downloaded thousands of times before it's taken down. That means it can't be stopped anymore.
Of course, some random guy talking about the conspiracy doesn't get this attention, since there's nothing supporting he knows anything about it (and in fact, doesn't). But actual, known astronauts and other NASA employees doing the same thing is sure to be an instant attention magnet. Once such a video was posted, there would be no way to "take it down". It'd just pop back up again, and gain even more attention, instantly.