Saying “prime reason” Is maybe overselling it a bit ^^.
I think the fact it’s Japan let’s them a bit too uncritically act amazed though, for the lady in red one: the location is reminiscent of Shibuya but doesn’t exist and doesn’t make sense, the text on billboards and signs is scribbely gibberish, and the woman face changes over the course of the video.
(Everyone should be unsettled by the godawful lack of perspective)
General weebishness is probably a bigger factor, though I wish I could gatekeep them out of that descriptor.
A key difference is that animals exists here and now, and I think most humans would viscerally understand animal shouts of pain as requests for help/food/space etc…
The quote is less about the unborn, and more about the real and ignored needs of disenfranchised people.
Help your fellow humans first and foremost, (which I would argue is well served by treating animals well, for sanitary, eco-system, or even selfish mental well-being by not having our souls marred by brutality)
Actual beings with needs: humans, animals > the unborn >>>>>> unrealistic hypothetical humans.