The fact is that a huge number of people in the US despise the very freedoms they claim to admire. The US was founded on colonialism, ethnic cleansing, mass slaughter and slavery (in fact Hitler used the US as the basis for his plans for the Third Reich).
The MAGA cult represents the most extreme ideas that hark back to those early days, a white supremacist ideology, poorly disguised support for racism, intolerance, admiration of gun culture and a distorted interpretation of Christianity.
Trump recognized this very early on and has stoked the flames ever since by seemingly legitimizing these kinds of ideals and harking back to some former time when America was "great".
He's never actually said when that time was but I suspect it was during the colonial period, where people could grab land from the natives and push them out or kill them, but be able to get rid of them. Blacks were never part of that, their ancestors were slaves not participants in the slaughter.
The freedoms we enjoy here today arose primarily from socially minded leaders and movements, not the colonizers and slave owners.
The abolition of child labor, the two day weekend, sick leave, employment protection for women and disabled people, none of this came from people like Trump. Trump said this in 2016
“I could stand in the middle of 5th Avenue and shoot somebody and I wouldn’t lose voters,”
and it's true, his devoted supporters would still vote for him. He used cold blooded murder as proof that his devotees would never stop in their loyalty. But a willingness to maintain support for and defend a man who commits cold blooded murder does
not demonstrate loyalty, it demonstrates
idolatry and it is that which is the threat, the unthinking idolators which stand poised to destroy the United States from within.