Gee gosh, haven't heard that clever and witty argument before. Not even vegans are trying to be perfect, they're trying to minimize suffering. The top comment didn't say they'd care about field mice, they said they don't care about sentience because they take pleasure in the products of its destruction. Not really interested in talking any more with someone that misses the point so obviously whenever on purpose or because of a lack of mental faculties. Bye.
The suffering of sentient beings that directly results from human activity isn't an accident just because the harm wasn't the main or direct intention. Factory farming is not ethically justifiable whether it's cattle, fruit, vegetables, or grain.
Braindead logic is thinking you're better than anyone else because the creatures you harm get left in the field to rot.
Do you seriously think your argument has even a tiny bit of sense to it?
Until harm can be eradicated, we limit it. Trying to suggest that people eating a plant based diet might as well not bother because field mice is absurd.