Actually the data is available. The city of Newark for example has implemented several small-scale social innovations during the past few years, and they focused very much on data gathering and statistics. We don't see that in the media because it does not fit their narrative, and it does not fare well for opinion-makers to stand-up for that either. But the data is out there
Google "Cory Booker". He is a politician, so any link I include here will create controversy, but his model was to implement small-scale experiments, collect data, and use that data to gather additional funding from external sources.