No. They're really not. The traps create a quick death by snapping there neck.
Some people want to release these mice back into the wild, but they'll just enter your house again.
Mice are disgusting germ disease carrying creatures that shouldn't be left to go about inside your house.
They crawl all over counters, leave their poop "droppings" all over everything. They can chew wires, and other important documents.
Mice should be killed and not set free.