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Everything you described seems like funding misuse to me. Using public funding to funnel money to private interests is corrupt af. The teachers aren’t to blame here, this is just what capitalism does, it corrupts everything it touches.
Really only the first point is corruption and corruption can exist in any system.
A lot of it is misaligned priorities and people and institutions who are unwilling to talk about and fix the hard issues.
I am not a programmatic expert, but I would suggest allowing more educator autonomy and they need to rewrite contracts to allow bonuses or raises for high performing teachers beyond what most current union negotiations entail.