With your free willed decisions that you make there is no one else, but yourself, that can take the responsibility for your actions. Sartre sees responsibility as something strong, because we have 100% free will we also have 100% responsibility for our choices. Although Sartre believes in individualism, this does not mean that actions that you make do not affect the other people in the world which is why we still need to take responsibility for them. So According to Sartrean Existentialism humans have all the free will they could ever take responsibility for.
In this clip, Sartre criticizes modern intellectuals as "specialist workers in practical knowledge," who apply "universal notions and practices" to particular purposes determined by a political establishment. This can cause a conflict of conscience: Sartre gives the example of scientists working on the atomic bomb, but also professors whose efforts solely benefit a small group of prosperous students. Sartre thinks intellectuals use this kind of conflict to feel better about themselves--they may sign petitions, side with the working class, etc.--while still not seriously questioning themselves. Intellectuals rage against the machine but are still playing their assigned role in it. "[They are] very pleased to have an unhappy conscience, because that is what allows [them] to denounce."