I'm not sure I support charter schools as a universal good, but they've actually proven to be pretty consistently effective at improving the educational attainment of low-income black/hispanic students [0-1]. When the local school system is a political quagmire and objectively failing in its mission to educate students, it's probably the only way out.
The meta-problem is that the people most actively involved in improving the racial educational achievement gap are precisely the type of people to reflexively dislike charter schools (because it's "right wing", although I see it more aligned with the centralization vs decentralization axis) and maybe even feel overtly threatened by them (because of their union job). Also, charter schools have to actually figure out how to get buy-in from low-income black and hispanic parents, figure out how to serve this community better, and can't hide behind the excuse of cyclical poverty + orwellian bureaucracy anymore.
I think a lot of educators really would rather work in a system where bad outcomes are guaranteed and thus not their fault, than one in which they actually have the ability to make more than just performative progress in serving the needs of their underprivileged student body.
[0] https://hechingerreport.org/proof-points-charter-schools-hav...
[1] https://www.kqed.org/news/11953408/charter-schools-show-gain...