The reason why glue traps in particular are horrible is because unlike snap traps, they aren’t an instant-kill, leaving the mice to unnecessarily suffer through starvation, often over multiple days.

There are documented cases of mice and rats self-cannibalising to escape glue traps, as well as cases where they break their own bones in the struggle to escape. It’s needless pain, even mouse trap enthusiasts are more often than not against glue traps because they see it as being needlessly cruel.

It’s easy to shit on PETA, but they have things right in this case.