Above all, they depend on 1) controlling all levels of education in the country and 2) then waiting for a single generation to pass until the newly indoctrinated masses support the abominations. They persistently and slowly chip away at our freedoms until one day we wake up slaves.
Education is another ‘key’. There has been some descriptions that detail how this was catalyzed in the early to mid 1900’s with “philanthropic” orgs’ grants to colleges/universities that nurtured a crop of willing travelers to do the bidding.
That is why I am all for vouchers. A solid voucher system can wrest the NEA control of the public schools.