How?...Why?
Because of apathy and appeasement and I share guilt in that as well. God bless my dad a veteran of two wars against communism in Korea and Vietnam but I remember as a kid him telling me about gun rights "they can't take them away the Constitution says so". I was apathetic based on what he said, not just regarding the 2nd but the 1st also and the whole Bill of Rights. When you live comfortable and just assume everybody believes in the same base line principle that is naive, and I was. A lot of things have woken me up to the fact that Americans do not any longer share baseline common beliefs in the last several years but the authoritarian COVID responses and the amount of people who supported those really opened my eyes.
There is a Marxist movement in the U.S.A and western nations, anybody that knows history and the ideology should be able to see this. Years of public school, college and media indoctrination is coming out in the open now and it is no longer a fringe movement. The U.S Constitution and western freedom based government ideology is incompatible with Marxism and the nation is becoming more and more divided.
However to address neo-cons who push a narrative also of "just to feel safe" with narratives like "we must fight them over there so we don't fight them here" who use patriotic emotional manipulation who promote foreign wars that last decades and end in stalemate or defeat with a select few enriching themselves and in the end make everything less safe, they are part of a "system" also.