Боже! какой бред...
it's so much simplier...
1. the consipracy definitely exists, but it's on the higher level - the Department of Education, government bureaucrats, school administrators, etc..
2. the teachers are partisan because they constantly hear democrats are good, they want to spend more money on schools, protect your union jobs, don't want to put pressure on you and your performance, etc...so who do they "care" about, the students or their own benefits?