For one thing, mice carry diseases and parasites, and secondly, even professional exterminators say that trapping them like this is actually the quickest, most painless, and most humane way to exterminate them because their death is instantaneous, whereas poisoning them causes a much slower and more painful death that causes them to suffer unnecessarily. That's also why they say when an animal is suffering, the best thing to do is to just shoot them and put them out of their misery.
Granted, I don't like killing animals, but again, mice are vermin.
Granted, I don't like killing animals, but again, mice are vermin.