If you were filming on someone's property, you would be held legally liable if you intentionally bull-dozed it just to raise production value. The same should be true of the damage caused to the bats in the Devetashka Cave. Bats are a valuable part of that regions eco system because they control the population of insects and rodents. The fact that there were so many of the bats killed or relocated because of the filming could have serious repercussions on the ecological system in that area.
Yes, there should be legal ramifications for the filmmakers of Expendables 2. They shouldn't necessarily go to jail, but there should be some sort of fine imposed. They should also have to make a short documentary, at their expense, about the bats affected by their film shoot and the responsbility filmmakers have to respect their environement.
Since bats are threaten animals for extension, it should for me illegal to shoot in a cave where bats are living in. Human action outthere can lead to dramatic conditions for the bats. Bats can feel attacked and try to escape. So for me, filmmakers should try to do without real bats.
Filmmakers should be made responsible for the harm to the bats. They should be made to pay fines for the sanctuary in a new location, or to make the cave hospitable to them again. Nature needs to be respected so we can keep animals safe. Even seemingly unimportant bats are important in our food chain and cycle of nature.