The traps are there to kill the introduced predators that hunt the Kea, their eggs, and chicks.
By disarming the traps there are more predators to hunt them.
on the other hand, having more predators culls the less cunning: the specific predator as an individual that was going to end up in the trap is probably not going to eat the specific Kea bird that disarmed this trap. So the Kea bird that disarms a trap has a benefit at a cost to the group of Kea birds, so comparatively this Kea bird has an advantage over the other Kea birds...
Stoats, rats, and posums are introduced invasive predator species in New Zealand, which prey on native birds such as parrots.
By disabling traps, the parrots increase their predator population.
A classic case of solving for a net-harmful local optimum.