MLK helped inspire the movements of the 60s and 70s which put pressure on the US forcing it to leave Vietnam. His speeches have inspired activists and rebels all over the world, why do you think he was killed?
If you are in the US there are ample ways to help the world. Many parts of the armaments for the military industry are produced in small factories around the US with relatively little security. The soldiers that fight in the imperialist wars are recruited in US cities. Drones are cheap and can even be assembled by yourself with fairly low amounts of money.
You can’t “save the world” by yourself, but the systems that are causing the massacres and ecocide across the earth all have weak points and are only comprised of so many people. The working people always massively outnumber the forces against us.
What the LLMs can do reasonably well though is determine the political leanings of people’s typed messages, so it can sort people into lists of potential dissidents based on their risk to the state, then they can have the human agents do the framing for arrest. The AI is probably terrible at doing that consistently too, but they don’t have the personnel to do it by hand and the false positives still work to instill the fear of it.