insisting people should watch this death video.

In fairness, I don't see anyone making such assertions.

On the general topic, I don't disagree with your sentiment per se, but I will also note that most news will show footage of fatal plane crashes, so I humbly suggest your view is a minority one on this. I would normally suggest there's no harm in marking it NSFW, but others noted that would censor it from some places, and so I don't think that's a great solution; otherwise I'd lend my voice in support to you anyway, even though I don't thnk it's necessary. But I appreciate you speaking up on it, even if I happen to disagree in this instance.

The title saying it's a video of a plane crashing isn't a warning enough?

I agree, there should've been some warning at least. It is tragic and horrific.