You are right but have to also concede that it is equally possible to not like something and want to improve it as well. 
Your entitled to your feelings on this issue; but it has done and continues to do some monstrous imperialistic things.
Engaging in illegal and proxy wars of aggression; instigating color revolutions and government overthrows; blowing up gas pipelines of its so-called allies; establishing military garrisons all over the World, and that's just the evil it has done on the foreign front.
On the domestic side, the Power Okole has been slowly shredding the Constitution and Bill of Rights; purposely not stopping domestic organized crime from bringing in illegal drugs, narcotics, fentanyl, etc. that destroys its own communities; leaving the border open to illegal immigrants that keeps American wages low; and etc.
And you are free to characterize those things any way your little heart desires.
The biggest difference I see between the Left and Right in the US is the Left wants to destroy the framework of the nation's government and replace it with socialist and Marxist ideologies. The Right, those you call MAGA, want to get back to the basics where our government represents the needs of the people.
One of the biggest changes between the American Republic you admired is the population growth. I can see how a member of the house or Senate can represent the desires of one to ten thousand people. But today each representative votes on behalf of 747,000 constituents in their districts. That really needs to change. As we've seen for about a century, Congress tends to vote according to whichever side of an issue makes the most noise or the largest donation. Reelection has become the primary concern for Congress critters, and lobbyists have much more pull than John and Jane Public.
The radicals and activists want to ignore or eliminate the US Constitution except for the parts that support their agenda. There was a time when the hippies and professional protestors only made their voices heard in the media and in the streets. Those same radicals grew up, when to college, and now operate under the guise of public service. The fox is in the hen house.
Obama said in speeches he wants to fundamentally change America. You can't love something and simultaneously want to destroy its very foundation. The fundamentals ARE the country -- they are the basis for all that we are. So, yes, it's possible to not like something and want to improve it, but the Left wants to demolish it and start from scratch so we more closely resemble other countries. The comparisons with other nations are endless whether it's healthcare, firearm bans, education or the economy.
The US is a unique experiment that's lasted over 2 centuries. Those who seek power and riches have perverted and circumvented the law to do their bidding. This country was founded on the belief that most people will do what is right. With the attacks on religion and morality, I believe we've started down a path that can no longer trust anyone to do anything that's not in their own best interest.
That is the foundation we need to improve upon. If we simply accept that's how things are, we are going to be living in a Big Brother Totalitarian state sooner than you think.