Having lived in the USA and the UK I've experienced the political contrasts. My gut feel is that the American political engagement, the way the media reports politics, and how people think as a result are to blame here.
So exactly what do I mean by that? Well for starters I believe that the American political structure doesn't lend itself easily to direct public scrutiny and transparency. I can't remember ever meeting an American politician except when it was in their best self interest... surprise, surprise right around election time. Barriers are set up making it difficult to get face-time with a Senator or a Governor. By comparison MPs (British Members of Parliament) are obliged to have open constituency meetings where a member of the public can arrange to speak to their MP face to face.
British politicians just seem more willing to me to engage with 'Joe Public.' For example, it would be beyond belief to hear that the US Vice President or some Governor of some state has a weekly call in radio talk show slot, yet Deputy Prime Minister Nick Clegg (kind of like the British Vice President) and Mayor of London Boris Johnson (who is more like a US Governor than a city Mayor) have regular weekly radio slot on LBC (a call in radio talk show) where they calls from ordinary citizens and sometimes take some intense heat.
Also understanding American politics outside of the likes of Fox and others (or what I would say is the "TV political bubble") is difficult. Sure there are some amazing publications one can read. The likes of the The Wall Street Journal, The New York Times, Time, The Economist, and Foreign Policy all spring to mind. However these publications are not for everyone and definitely not read by the masses.
In comparison, the Sun and other tabloids, manage to break politics down into bite-sized blurbs that focus on the important parts for the everyman. I believe that this allows Brit Joe Public to be regularly informed on politics and therefore more engaged. So well much could be said about how bad tabloids are, I think they provide a valuable public service keeping people informed and from time to time crucifying the odd politician or goading them to action.
If there was maybe more public political engagement, more willingness for politicians to be accountable and less special interests on capital hill maybe the average citizen would understand why data protection is important and feel they have the leverage on politicians to enact it.