I'm not against OOP getting their revenge, but yes
it's just an insect and you are just a human. ^[assuming you are a human. Not sure, but I'll go with that.]
Just because it's suffering isn't as relatable to you as mammals, doesn't make it fine.

I remember having been answered once for plants, on their responses to stimuli and poisonous features are "just evolutionary".
Now, what most people find it hard to imagine, is that for some being significantly higher in the evolutionary path, can consider our brains as "just an evolutionary feature".