Here’s my take on what the left is doing:
As we know, the left hates successful people, and those more intelligent or capable than the average. (That is also why they hate Jews, btw, since on average they are more successful - and despite millennia of bigotry.) It flies in the face of their insistence that “everyone is equal” - or their belief that the lack of such is what causes all the world’s problems.
The same applies to America as a whole. We WERE the best country in the world just 50 years ago. We had the most scientific, technical, medical, etc., advancements.
The Left hates that. Obama actually did a world tour apologizing for us! The left rants about this being a racist country, which of course is not true. The left got rid of the entrance exam at Thomas Jefferson High School for Science and Technology to get in less intelligent/capable kids - and pushed out Asians.
And the Left figured out that they can dumb down our country, and have more semi-literate, unskilled people, if they import them from 3rd-world shitholes. That is why they have a fit if people come here from Europe but defend even the most criminal who are here from San Salvador or Nicarauga.
The Left will not be content until they have transformed a once-superior country into another Guatemala.