As always, PETA is being silly. Saltwater crocs are one of the few animal species that actively preys on humans, so naturally a community is going to see it as a threat. They're not going to kill it, but instead use it as an attraction for ecotourism. This could provide the community with economic benefits (because you know, fishing communities typically wallow in wealth) and help conservation efforts.
PETA seems to like to ignore the fact that humans are animals as well, and we respond to a lot of the same basic stimuli other animals do. In this case , it's a response to predation. The only difference is our higher intelligence and ability to reason that an animal like this may prey upon us. This ability to reason is one of the reasons that some of the apex predators that will hunt humans are endangered; we're killing them before they kill us.