Lots of people do care. However, lots of other people are assholes, and support this sort of behavior. I hestiate to be political, but it's almost universally acknowledged that Australia's Prime Minister, Tony Abbott, is a conservative ideologue (his party is named the Liberal party, but in the economic rather than the social sense; it's broadly center-right) - broadly pro censorship, dislikes immigrants, seems a bit racist towards aboriginals, hostile to expanding women's rights, and famously disbelieves int he idea of man-made climate change and has dismantled Australia's carbon tax. There's a large constituency that supports this sort of thing and who are quite happy to tolerate heavy-handed security measures.

Because a lot of people are assholes, thinking they'll be better off by keeping people of whom they disapprove in an inferior position. I apologize for stating my views so crudely, but I think it's politically naive to assume that other people don't care because they don't understand or haven't thought through the long-term consequences. In many cases, they understand just fine,; they don't care because they are selfish and want others to be forced into compliance with their views by the power of the state.