Supererogatory standard — schopenhauer1
I looked it up, but this is a totally new word to me. I believe in avoiding rare terms where common terms will serve as well.
Look, your thread title is "What makes a ghetto what it is?". In my book, the term "ghetto" requires poverty. A gated community of millionaires is a "ghetto" only in a satirical sense.
What makes ghettos is what makes people poor. The wealth pump extracts money from working people through reduced wages, reduced benefits, longer hours, inflation, and regressive taxes which penalizes working people much more heavily than rich people. The working class (90% of the population in the USA) is in a 50+ year period of gradual loss. Most working people are significantly poorer now than they were in 1970. The most unlucky working class people are now immiserated. They end up in dilapidated housing because they can not afford better. If they own their own home (which many working class people do) it may be becoming more dilapidated because they can not afford to maintain it.
People who are gradually forced down to the bottom don't just sink, they change on the way down. The milieu of poverty produces alienation and anomie. They do not feel a sense of belonging responsibility, shared community, and so on. They feel beaten, and they are. It is very difficult to get off the bottom once you land there.
How people PERCEIVE the ghetto and the people who live in it is where your conservative red herring and liberal straw men make their entry. Their opinions are relevant because effective political/economic/social intervention will, or will not occur based on one's ideology. The main response to ghettos is slum clearance -- just level them. The ghetto will then disperse and regather somewhere else, because the poor are still poor. Only their ratty, run-down, unsafe, unhealthy tenement has changed (it's now in a landfill). One response (more "liberal") is to replace the slum with nice but durable townhome units and select the residents from the ghetto carefully. Another, more cost conscious response is to replace the slum with "a ghetto in the sky" -- high-rise buildings filled without careful selection.
Ripe ghettos don't have a whole lot of community. There is too much transience, instability, unmet need, crime, etc. for people to bond with lots of other people. Poverty, isolation, anomie, and alienation again. Add cheap alcohol, and plentiful person-recking drugs, and you have a social sink added to the ghetto.
Circling back to the question of "agency": The only people connected with the ghetto who have real agency are the rich people (landlords, investors, real estate interests, speculators, building companies, etc.) who created the ghetto in the first place through very specific policies.
There are some great books on how people get fucked over in the ghetto:
Evicted: Poverty and Profit in the American City by Matthew Desmond is an excellent account of how landlords make money renting ghetto property to the poor.
The Color of Law: A Forgotten History of how the Federal Government Segregated America by Richard Rothstein. FHA and VA home loans programs created both the white suburbs (and contributed to white wealth) while, at the same time, concentrating poverty and denying opportunity in the inner city.
Several books about Detroit show how corporate policies and corrupt government turned Detroit from a really great city into the shit hole it is now.
Numerous books about the Chicago Housing Authority show how slum clearance and urban renewal ended up creating new, and worse, ghettos. Most of Chicago's ghettos in the sky have been torn down, replaced by housing for "nicer people". Many of the former high-rise residents received Section 8 housing vouchers. Whether and where they used the vouchers, how well it worked out, and where the former residents are now is mostly unknown.