I teach in the area, it's entirely political.

There was one school, count them, one school, in all of hisd's 267 schools that consistently failed to meet state standards. The board also continued a meeting after closing it to the public, after some on the board made a controversial decision regarding the continuation of the Superintendents contract. this is against states law.

The state moved to take over HISD back in 2019 because of these things. But due to legal maneuvers and covid the process was delayed. In tge interim the entire school board has been replaced except for one member who was not involved in the controversy, and Wheatley High School, which serves one of if not the poorest and most crime ridden communities in the city, met the state guidelines.

The state still chose to take it over despite being a large urban district and averaging a B by the state's own metrics.

Vouchers are coming, I gaurentee it. Furthermore, there are many other districts with far more failing schools than houston, but those districts aren't nearly as left leaning.