Why didn't they post it on the Rachel Maddow video too?
Before answering that - Once again, this is irrelevant to the point that was made in what you responded to. You posted two extremely similar videos. The first was marked, the second was not. In a case like that, YOU were the one who has created ambiguity and the onus is on you to be clear about which you're referring to when you reply. If you don't, you can reasonably safely expect that you will be called out for that.
Now, for the question you asked here, it immediately begs the question - "What does it take to get that tag added?"
On a quick check, either creators or YouTube can add it. YouTube's method to detect whether to add the tag if the creator does not is nigh certain to leave plenty of room for videos to fall through the cracks or not have it added in a timely manner, though. As things stand, Rachel Maddow fakes are much more likely than average to be created by bad actors who would have no interest in applying the tag. That the first video was marked and the second video was extremely similar to it is a yellow flag for the second, even though it wasn't marked. Hence, asking for further confirmation is reasonable.
I mean, there are a lot of news items about the fat clown that don't have another source, but some folks don't question those reports. Why not?
I think that it's safe to say that the first video that you posted was tagged is the first big issue that put people on guard. The second issue is that Rachel Maddow fakes made by bad actors tricking people is a known problem. As for the fat clown in question, fakes of him are pretty pointless for those who oppose him, given his constant stream of actual BS and evil. Bad actors creating fakes to muddy the waters would be very unsurprising, of course, but there's relatively little room for butt into the picture, given Trump.
Edited to remove a bit about Nissan, because oops, tired.
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