The leftist indoctrination in government schools and public education is much worse than you think. Stefan Molyneux discusses some firsthand accounts of leftist abuse in public schools and the environmental toxin that children are exposed to on a regular basis.
The best way to stop this is to take away control of education from the Left by supporting political candidates who back school choice along with starting substitute school systems. If it is financially possible, remove your kids from public schools if your children attend them already.
There are efforts afoot to create alternative education choices and they must become a much larger trend in order to be effective. Once done, the Left can no longer indoctrinate children and, thankfully, they and their utopian cathedrals will be gone.