The cockroaches are a very important detritivore in their environments... so we better not harm them either!
I think your view may be a little over romantic and unpractical Octapush... its a by-product of humans being the most successful animal this time around.
Actually, I am all for the eradication of horses, rabbits, cats and small yappy type dogs... I am sure I can alter the Spider-splattering device to deal with all of them!
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