No one absolutely no one considers that to be remotely true. Look at French banlieues, German Plattenbauten or British Councils - they are synonymous with Crime and physical as well as cultural despair.

And while Vienna or Stockholm are often cited as Utopias, the citees often intentionally leave out the negative side effects (ie. Waiting-times of years, housing black markets, etc) that are eventually coming full circle to the thing they were proposed as a solution against. Just with much less transparency.

There have been social housing projects that paint a more nuanced picture, eg Hamburg-Steilshoop, where a giant block (for EU standards) has been erected in the 1970s and was basically divided into three sections: one to be run by existing housing coops, one by owner occupants, and one by the city. Needless to say that those parts run by the city were quickly becoming a prime example of a German „banlieue“ while the other parts became a prime example for those eager to dismiss any criticisms.