tarantula vs bird

i never realised how self righteous some people can get, until i read the comments for this video.
it is fascinating to watch nature in action. it is fascinating to watch animals kill each other, mate with each other, hunt each other, eat together... etcetc.
but if i were to put it down to curiosity of the spider's owner - he wanted to see what would happen - then i think that ignorance and curiosity on his part are lame excuses.
from the comments, spiders CAN eat birds, but not in excessive amounts due to the high calcium content. well, its just ONE chick. there's no indication whether the spider was on its 5th chick or whether its the first chick the owner ever gave it.
most of the commentors took issue with feeding it a chick. a BABY BIRD which hadnt any chance to see the world. you're all personifying a bird ffs. animals are animals, humans are humans.
and if you're so concerned about animal rights, then what about the mouse or the cricket you're recommending in place of the chick ? lol ? those aren't animals?
and who are YOU, or WE as HUMANS to determine an animals' rights?
*rant.