I thought we already had a thread on that (
Yet another Trojan). I thought I commented about the badly labeled story on some site about this very Java app. The Trojan in no more "targeting" the Mac than anything else that runs a Java virtual machine. And, since it's a trojan, it is not able to do anything to anyone system until and unless they specifically allow it to. People who automatically enter their password whenever they are asked is the problem. I suspect they are the same people who respond to SPAM so it can continue to spread and cost people money, time and difficulties with their computers.
I think the term is "Human Engineering" when it actually is inattention, lack of knowledge, refusal to search for info and just possibly a little human ignorance. In a strange way, I almost wish there actually was a Mac virus so people would stop automatically assume that they can do anything they want and not have any problems.