I can't speak for other countries but I think you have misrepresented Canada. I'm pretty familiar with development around Toronto, and in Winnipeg, and I haven't seen a big trend to gating/walling. The greater Toronto area has (unfortunately) experienced massive suburban sprawl and the occurrence of enclosed communities is extremely rare. Here and there there might be small developments of 10-20 attached houses that operate more like a condo than private homes, and have shared lawn space and a communal pool. Those might be walled off and have an unobstructed driveway rather than street entrance, but that's about it. It's true there are larger developments that don't attach to the surrounding grid on all sides, but instead flow out through several exits onto one main street, but they often contain hundreds of houses and within their boundaries there is no gating. Their lack of street connections is not intended to keep riff-raff like us out...it's designed to reduce car traffic by pushing it out onto the main streets, and often there are pedestrian and bike access points all around.

Robert