You're over simplifying the first, and conflating the other.
The MLK protests made change on the back of decades of campaigning together with multiple organisations applying different types of pressure and activism for the same goal, including president Kennedy, and several PR disasters for the opposition.
As for the 2001 attacks, what would you say was their political goal? Was it fulfilled by those attacks? If not, I'd scratch that up as a failed attempt.
"Nuh uh"