And people should be okay with his persecution by the people who had the political upper hand in that era? No? Then why should anyone be okay with deplatforming Alex Jones (as bad as he is) by whoever has the political upper hand at the moment?
Because one was a indispensible paragon of civil rights and an avatar of anti-racism and the other is a shrieking whackjob entertainer peddling freeze-dried survivalist food while spreading lies, mental illness and grief to families of murdered kids.
Hey, you're the one who brought up history.
Hey, you're the one who failed to think things through. The tired old "b-but deplatforming will only ever by used against _bad_ people" argument is exactly a failure to appreciate the lessons of history, of which MLK is an excellent example.
No, I'm the one who corrected an utterly insane equivalence drawn between a commercial figure who drives grieving fathers of murdered kids to suicide and a man who was literally killed for his demanding equal treatment for all people. Again: if you bring up history, you are now forced to deal with historical results and categories. Deal with them. Don't just pretend you are.
It's ironic that, on a site where the UNIX philosophy is widely appreciated, that so many fail to appreciate the wisdom of the old quote "UNIX was not designed to stop you from doing stupid things, because that would also stop you from doing clever things.". So too, with Alex Jones, MLK, and freedom of speech.