If people have never been exposed to wildlife it is unreasonable for them to care for it.

That's a good point. But I'm not sure I agree completely. While I have never seen a shark in my life I still care a lot about the conservation of them, so it's not necessarily needed to interact with all animals. I believe that some species are best left of to stay wild, but eh, that's just my opinion on the matter. Wildlife tourism certainly has a lot of positive aspects as well, and I have personally begun my interest in biology because I loved seeing animals when I was a child.

they chum (put blood in the water) to attract Great whites to the cage and there has been a massive increase in shark attacks, which gives it a bad name

Wow, that's one thing that had not crossed my mind. I guess it might not be such a smart idea to have these shark cages close to places where people swim or surf..

PS. sorry for not answering sooner! Some of my comments got buried in my Replies feed, so I forgot all about them.