People say that because they support it and they don't think it's a big deal. There were always anti-eugenicist movements (and always people opposed to fucking children, and having slaves, and even eating meat or going to war, and other morally shitty things justified with this excuse). That's literally how the movements against these things came about - people throughout time have been against them. You just discount them because you align yourself with the other side, for some reason.

Tesla was not mentally well. But he had the power to make weapons, including a so called "Death Beam" https://www.pbs.org/tesla/ll/ll_mispapers.html

And look, Trump connection:

After a three-day investigation, Trump's report concluded that there was nothing which would constitute a hazard in unfriendly hands, stating:

"His [Tesla's] thoughts and efforts during at least the past 15 years were primarily of a speculative, philosophical, and somewhat promotional character often concerned with the production and wireless transmission of power; but did not include new, sound, workable principles or methods for realizing such results.[233]"

In a box purported to contain a part of Tesla's "death ray", Trump found a 45-year-old multidecade resistance box.

https://www.pbs.org/tesla/ll/ll_mispapers.html

An operation code-named "Project Nick" was heavily funded and placed under the command of Brigadier General L. C. Craigie to test the feasibility of Tesla's concept. Details of the experiments were never published, and the project was apparently discontinued. But something peculiar happened. The copies of Tesla's papers disappeared and nobody knows what happened to them.

The morning after the inventor's death, his nephew Sava Kosanovic´ hurried to his uncle's room at the Hotel New Yorker. He was an up-and-coming Yugoslav official with suspected connections to the communist party in his country. By the time he arrived, Tesla's body had already been removed, and Kosanovic´ suspected that someone had already gone through his uncle's effects. Technical papers were missing as well as a black notebook he knew Tesla kept—a notebook with several hundred pages, some of which were marked "Government."

P. E. Foxworth, assistant director of the New York FBI office, was called in to investigate. According to Foxworth, the government was "vitally interested" in preserving Tesla's papers. Two days after Tesla's death, representatives of the Office of Alien Property went to his room at the New Yorker Hotel and seized all his possessions.

Dr. John G. Trump, an electrical engineer with the National Defense Research Committee of the Office of Scientific Research and Development, was called in to analyze the Tesla papers in OAP custody.