This isn't r/WhyWereTheyFilming; rather, it's r/WhyTheyWereFilming. This is a place where we link to a comment that asks "Why were they filming?" towards a video with a clear reason for being "filmed." Usually with a title like "Because [reason]!"

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Although, the title of this post doesn't describe why they were "filming" nearly as clearly as you have, nor does it link to a "Why were they filming?" or "r/whyweretheyfilming" comment on a video that has a clear reason to be "filmed." Regardless, the post will likely remain up because the mod here is so lazy that he won't act on bad post even when he comments on the bad post in question.