Earlier quoted context omitted.
I'm fairly certain spiders are not concerned about the suffering of the butterflies they consume..
Are you seriously comparing animals killing and eating other animals for food with what we do to animals and birds in slaughterhouses? Have you watched videos of slaughterhouses? Have you seen how fur is plucked off rabbits for angora, and feathers off birds for down jackets? In almost all cases, the skin also comes off and they are not even killed after the act but mercilessly left to die on their own. Almost everyo…
Maybe humans should do better because we can, but if I am going to go about stopping other humans from committing horrible treatment, why should I then 'make peace' with how other animals behave? But to make this problem worse, look at how some animals mate. If you were to only allow peaceful instances, the species would be extinct in three generations. But maybe that is the good thing to do, because the duty is to the individual and not the species. Perhaps the humane thing to do with the spider is to not kill it, but to stop reproduction so there are no more spiders killing butterflies.
Morality sure is weird.