https://en.wikipedia.org/wiki/Nobel_disease
Each of the videos you linked to have extremely plausible, fairly mundane explanations other than "aliens". That fits the pattern. That you find them compelling as evidence of extraterrestrials is not a great sign.
> When the video gets too good you can blame it on computer generated graphics.
The corollary here is the unfortunate fact that as soon as everyone got a camera in their pocket, aliens stopped landing in random cornfields to say hi to lonely farmers.