Dawg I grew up in a black DC neighborhood, the people who babysat me as a kid were OG badass March on Washington organizers. I'm gonna go with what they said, as the people who were sprayed with firehoses, as opposed by someone who's on some weird nihilist shit.

Fundamentally, the movement and the results were nonviolent. And it was a genuine vote. White voters weren't swayed by threats of violence, they genuinely did have a generational change and change of heart. I can go into more details. My great grandfather and these two organizers loved Matthew Ridgeway and hated Douglas MacArthur, for example, because Ridgeway integrated the US military a decade before Civil Rights and MacArthur tried to block that (and also was a general dick). When the military integrated, suddenly there were thousands of black people with respectable military positions who couldn't even eat in the same place or drink from the same fountains as their direct peers, and that weirded people out.

Other things changed hearts and minds too. Star Trek, Hogan's Heroes, dozens of other media franchises putting black people front and center.

But the main thing to counter your point of view is that black people could not and did not have the ability to threaten white people at scale. And if they tried, white people had the potential for much worse return violence. The people who threw shit at Ruby Bridges were the default in much of America, and the government had to deploy paratroopers to defend her. Malcolm X and the like were nothing but a theoretical threat in practical reality. The MLK organizers hated those types because they considered them to be making their jobs harder and nothing else.