One voice

The question, can one voice move a crowd to action is a debatable one, perceptively due to the fact that the givens of the question are not clearly defined. If "can" is interpreted to mean that it is valid to manipulate the givens to support the findings of at least one circumstance in which the statement holds true, then the answer to that question would be yes. Because the givens are not defined, I shall establish the conditions, which have not been set and evaluate the chances of success for the lone voice. One is crowd size. With a very small crowd one voice does make a difference.  If there are three people, it is quite easy to sway the opinion of the other two. One is how radical a change the voice advocates.A more radical change from the norm will require more time to sway the crowd into believing in swaying a change. Time can also be an important variable because when a person is given a large timeframe, they do not have to attack all the different viewpoints simultaneously. A voice can then attack one individual at a time, gradually building a general opinion. Finally another variable is the malleability, often inversely proportional to age, of the crowd you are trying to sway. A more malleable crowd might require less time and effort to change an existing opinion. With five variables and only one equation, I cannot solve this question, however, I can provide a useful, highly accurate equation based on how the aforementioned variables are set. 

then the plight of the individual will succeed. In all other circumstances, the plight of the individual will fail. 

For E=effort put forth

x=Charisma/ability of expression 

m=malleability of audience 

t=time

n=number of people

 Rn=Radiclicity of norm

Ri =Radiclicity of ideal

Where n is > 0 and Rn≠Ri