I don't think anyone who keeps JAGS is a bad person, but people who do are somewhat supporting their history of smuggling in an indirect 'passive' fashion. Is it because they are established here now that we can forget the nasty ways they got to Australia? Do people with JAGS simply say, "I didn't smuggle them so I'm not doing anything wrong"
The raw truth to purchasing a JAG is, "Do you support animal smuggling?" This applies to those wanting to breed them and to those just wanting a pretty pet. Ask yourself as you contemplate your next purchase.