It's still good science isn't it? Not even physics is exact anymore really. ":3
Well like I said, we can already figure out pretty well what people will buy, who they'll vote for, and even how groups will act, with some degree of accuracy.
A psychology student friend of mine (who I can't stop making fun of for studying psychology) showed me a book recently talking about the applications of chaos theory in group psychology which contained some pretty crazy math. Of course I wasn't exactly sure about how my friend was going to understand 3 words in this book and write a paper citing it when he stopped taking math in grade 10 but, I did gain a healthy new interest in psychology where before I'd mostly been pointing and laughing.
I can't seem to make myself scared about the concept, really. Seems to me that predicting the precise behaviour of an individual would be unfeasible outside a laboratory and predictions about groups have less sinistre implications.