Various Palestinian Arab groups did EXACTLY what Ghandi said, and had no weapons. They were slaughtered. You can read Einstein's words about one such city in 1948 in his letter warning about Zionism being the same as Nazism. Your "be like Ghandi" viewpoint is utter bullshit and doesn't work.
Ghandi failed in India, UK didn't leave because of him and crushed his "lead India" movement in 1942. UK left later for other reasons having to do with structure of government changes in India.
Blacks all didn't do the Ghandi thing, there were race riots and police assassinating black leaders and all manner of violence. Take off your rose colored glasses, blacks haven't escaped from segregation and oppression and being slaughtered either, that's still ongoing.
You are offering a delusional romantic view that has nothing to do with reality. Your doormat Ghandi and anyone like him got stomped.