I don't deny that it's happening. You, however, are ignoring that academics all have an agenda, and that agenda is to protect their point of view and their research conclusions. In the 1976 the mummified remains of Ramses II were sent to France for scientific examination. One of those scientist was Dr. Michelle Lescot who was expert in ancient plants and plant fibers. She examined the cerements and she found vegetable remains which she identified as tobacco. No one has been able to show that what she found was not tobacco, and she carefully examined Ramses' cerements and remains before witnesses while being filmed, and came up with tobacco once again--basically, no one has ever commented on it. The mainline Egyptologists have as an article of faith that there was no contact between the "old world" and the "new world," so they simply ignored her. She became a pariah, her career was over.
Then there's the Solutrean hypothesis. The Solutreans were a paeleolithic culture in what is now France and Spain, and they were unique because of their flint knapping technique. They developedd bi-facial pressure flake flint knapping, which allowed them to produce much lighter, thinner blades with much sharper edges. Modern researchers have duplicated their technique and are convinced that this is a superior technique, and that the spear blades they made would have been much more efficient at penetrating an animal's hide. Their technology was thousands of years ahead of their times. The Solutreans eventually were replaced by the Magdalenian culture, which did not use that technique, and whose flint knapping was older, "traditional" flint knapping. So what happened to the Solutreans?
A small body of researchers believe that they came to North America between 25,000 and 20,000 years ago--thousands of years before humans are thought to have come from Asia by the land bridge. Bi-facial, pressure flake knife blades and spear points have been found in many places on the east coast of North America, from eastern Canada to Virginia. Aunt Bee has a thread about a find with such a spear p0int which dates to 22,000 ybp. More significantly, there is ancient European MtDNA in about 3% of the Amerindian population of both North and South America. In eastern Canada, that rises to 25%.
But the traditional academic theory is the land bridge theory, and the culture is referred to as Clovis, because of bi-facial pressure flake blades found near Clovis, New Mexico. That site was dated to 11,500 ybp, and, of course, thousands of academics have based their careers on the land bridge theory of the human population of the Americas. How have they reacted to the Solutrean hypothesis? Stony silence, or elaborate denials if pressed on the issue. That evidence for the Solutrean hypothesis mounts means nothing to them--it's not consonant with the theories on which they have based their careers, so they ignore it.
All academic researchers have an agenda, and that agenda is to protect the hypotheses and theories upon which they have based their careers. That doesn't mean there's a dark, nefarious conspiracy, it is just the recognition that that's how it works.