Quote (howtodisappearcompletely @ Apr 13 2016 12:44am)
Can you elaborate on the "offensive" vs "defensive" thing?
For the offensive things, it's people going out of their way to find the animals and hurt them, or force them to breed and hurt them.
Killing a mouse in your house that might damage your furniture, make a mess, eat some of your food or whatever is defensive. I mean, in the simplest terms, a vegan still swats at flies in his or her face.
Quote (howtodisappearcompletely @ Apr 13 2016 12:24am)
there's no real explanation as to why some of the "offensive" things are widely accepted and others are condemned by animal rights activists
Regarding "widely accepted", i.e. accepted by the average person, that's because the average person isn't deeply critical of the ethical implications of their actions, at least to such a degree that it convinces them to break away from the norm when they find that the norm is unethical.
Animal rights activists universally condemn everything you listed except killing a pest in your own house.