You make a very good point. This is something that London (at least) does well. Council housing is available across the city and you will often find amongst so

You make a very good point. This is something that London (at least) does well. Council housing is available across the city and you will often find amongst some of the wealthiest parts of the city alternating blocks of council housing. It might indeed be a pain point for those who bought their £1M town houses to then have to deal with the consequences of a whole council estate across the street but it has (so far) prevented the ghetto-ization of swathes of our capital which seems to affect Paris for instance which has less of a mix of housing.