"America is no Soviet Union" is perhaps a temporary condition, but one for which we can, at least, be temporarily thankful. (Remember that in 1991 there were massive protests in Moscow in an attempt in the Soviet Union to unseat Mikhail Gorbachev. The protests proved unsuccessful, but the "good news" was that the Soviet military [unlike the Chinese army at Tienanmen Square, who killed several hundred demonstrators] did not open fire upon the civilian demonstrators.)
I am not disputing that the Soviet Union had massive protests--I believe recently as well. I am stating that we are a long way from being as oppressive, and dysfunctional as the Soviet Union. Also, the Federal Government would have a pretty big issue getting the whole of the military, on American Soil, to beat down massive protests. big difference between the U.S. and Russia: U.S. has 80,000,000 gun owners; Russia has, well, from what I could find: 2-5 firearms per 100 persons.
You are certainly free to believe what you wish to believe... even if it is leftist BS. Humankind - until impeached by the actions of of a restrictive society - has a birthright of freedom. If a person decides to ignore societies impeachment of his free behaviors, he may continue to enjoy his freedoms until the moment he is terminated. During WWII, many of the imprisoned Jews would sing a German song, "Die gedanken sind frei" (roughly: My thoughts are [mind is] free), as a form of protest and an expression of their freedom. Granted that, in the final analysis, it did little for their physical well-being, but it did wonders for their morale.
Well then, as I stated, Man has no inherent Freedom, if Man does, it stops the second Man is social (either by choice, or born-into). Jews were right in Principle: [the mind is free].
Martial law may, at some point, be imposed, but can it be maintained for any significant period of time without the full support of the military (many of whom actually understand their "Oath of Allegiance"? The true importance of 2A may not be realized until the government attempts the unwarranted implementation of Martial law). The oath is written in plain English, and says in part, "...I will support and defend the Constitution of the United States against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same...". The Soldier/Sailor/Airman/Marine's first allegiance is to the Constitution, anything that follows that is secondary, and - if in contravention of the Constitution - may rightfully be ignored. You sound as if you plan to just roll over if Martial law is ever invoked... which most liberals will probably do. Pax...
There are a number of reasons Martial Law can be imposed. Here in the States, unlike most other States, I think 'they' would be hard-pressed to maintain order under Martial law; IMO, it would turn into a blood-bath.
Also, the Second Amendment won't mean squat under Martial Law, hell, under any Government mandate that restricts citizens--but by that point, the whole of the Constitution would be irrelevant, IMO.
I hope military persons would not follow orders to round-up citizens, but we know that isn't the case much of the time in other States where we have observed the State's military level protesting citizens in the streets.
I really believe that the Federal Government would not ban firearms, or impose some sort of military rule; America would become a very violent place. Although, America is slowly becoming a Police State, IMO, it's incremental, but present none-the-less, and more of a threat than any Military Style oppression.