I'm not talking about a 10+ story apartment building in the middle of the city, I'm talking about replacing the low-density 4 bedroom houses in your safe suburb

I'm not talking about a 10+ story apartment building in the middle of the city, I'm talking about replacing the low-density 4 bedroom houses in your safe suburban neighbourhood with high-rises, allowing for a much denser community which would enable you to walk to your grocery store, school, etc. instead of having to drive everywhere. You could just as well surround the high-rise neighbourhood with a 5-metre high gate and have armed security guards patrolling everywhere if you'd like. I've lived in both an American-style suburb and a development described above (minus the gates and security guard, Eastern Europe being exceptionally safe) and I much preferred the latter.