That was my question too. I had a mouse once and there was no way I could have killed it immediately, it was just too fast for me and it was like it had its escape routes already planned out! It took days of laying out humane traps, a whole jar of peanut butter and various other foods to finally get it.

Until you end up with an infestation of mice or an illness from the potential diseases they carry. I love animals. I also think mice are cute. But there's a difference between a cute little pet mouse and a potentially-diseased wild one being inside the house, and the OP obviously thought the mouse was the latter. I remember when I was little, we had a mouse infestation because mum refused to kill any mice she saw in the house. So they'd always make their way back to the house, breed, and we'd end up with even more mice in the hose next season. They ended up everywhere, even getting in our bird aviary too and killing some of the baby birds when they first left the nest. Must have looked like easy food or something. :( So yeah...I don't begrudge anyone for killing pests they find in their house. As long as it's done quickly and humanely.

I can see your point of view, and I understand that an infestation can't be very pleasant, and there is a big difference between a wild mouse a pet mouse. However, I just can't see how anyone can kill an animal, even if it is a wild mouse. I usually release them where there are more houses around. However, I do see why people think they're pests and I understand your point of view.