There is zero dispute that America, has over the years, specifically attempted to assassinate or have assassinated prominent political leaders in foreign nations, such as several attempts on the life of Fidel Castro of Cuba, and successful assassinations of Prime Minister Lumumba of the Congo, and Commander Torrijos of Panama, to site just a few. While sometimes these assassinations are done by USA personnel, they are also accomplished through proxy under the direction or guidance of the CIA and approved or sanctioned by the upper echelons of the US government. It would be nice to report in this present age that targeted killings and assassinations are all things of the past, but in actuality, America seems to have substantially stepped up its targeted killings through drone strikes, SEAL team raids, and so forth, with apparently nary a worry or concern that America is violating the sovereignty of foreign countries or interfering in their domestic affairs. As bad as that might sound, it gets worse, as America does not limit itself to simply taking out "bad" politicians, or "bad" generals, or "bad" guys in general, but appears to believe that those that have certain scientific knowledge, such as nuclear scientists, are also legitimate targets to kill as well, whether it is done by proxy or not.
The most basic issue with targeted killings and assassinations isn't really the misses, the wrong targets being killed, or the collateral damage that is created by dropping bombs, shooting, or by poisoning the wrong person, but more a matter of, the rule of law. If, the most powerful country in the world doesn't believe that the law applies to their actions outside of their own domestic country and that they, alone, or in conjunction with other countries, can decide who should or shouldn't be elected or serving in office, or who should or shouldn't be a general, or what knowledge scientists should or shouldn't be allowed to exercise, than in reality, there is no boundary that America isn't permitted to cross with apparent immunity, especially when dealing with countries that simply don't have the resources or power, to possibly stand up to a nation such as the United States of America, and they with no outside recourse to appeal to the world justice for redress.
The thing that all of these assassinations and targeted killings that make the whole nefarious affair, such a disgrace to a country as great as America, is that the killing or the compromising of powerful people of other countries, does not bring peace or resolve whatever the perceived problem was, whatsoever. All that this killing really does is change the players, but often the game remains the same, but even if the game was to change, the underlying problems, the underlying issues of a given country, cannot be rectified by something as simplistic as an assassin's bullet. Then too, it is one thing to take out a national politician, or a leading general, as these men are usually aware that there may indeed be powerful opposing interests who do not wish to see them alive in their current position, but it is an entirely different thing to take out innocent civilians or to take out scientists just because they are utilizing and applying knowledge, that America or its proxies, believes should not be used or applied.
America acts far too often as judge, jury, and executioner, never once recognizing that there will come a day when the chickens will surely come home to roost; to which, so too, America seems incapable of acknowledging that an assassin's bullet never can and never will lead to lasting justice or an honorable peace.