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Oh, they know exactly what they're doing.
It's often not even the same crab. Can you recognize individual members of a species you've never seen before?
Why is the crab in danger? So you will keep watching. Creating mortal peril for your subjects is SOP for wildlife videography.
There's more awareness now, and you can't be certain that's what you're looking at nowadays, thank goodness, but there's still a lot of that. Because the networks pay for it.
Mainstream television has this weird superstition that everything has to follow one of a few specific plotlines very closely, or nobody will watch it.
That said, I miss the old school nature documentaries sometimes, because either they prioritized information over their narrative (Nature With George Page), or they went full send with an actually good narrative (Wild America).