Henry Kissinger (Former U.S. Secretary of State) - Expressed concerns about NATO expansion increasing tensions with Russia over several years, particularly noted in discussions and forums during the late 1990s and early 2000s.
William Perry (Former U.S. Secretary of Defense) - Voiced apprehensions about the strategy and pace of NATO expansion, particularly in the late 1990s during his tenure and in reflections thereafter.
Sam Nunn (Former U.S. Senator, Co-Chairman of the Nuclear Threat Initiative) - Warned of strategic miscalculations and heightened conflict risks due to expansion, prominently during the late 1990s and early 2000s.
Jack Matlock (Former U.S. Ambassador to the Soviet Union) - Criticized NATO expansion for potentially setting the stage for conflict with Russia, in articles and public lectures, particularly during the 1990s.
If all source material that you can find is hyperbolic nonsense, then you have made up your mind before looking.
Yes, that's how propaganda works. But in the face of new information, that propaganda has to be tweaked or abandoned. To keep hammering the same message produces quickly diminishing returns.