I am going to try to correct this sentence, but, since I don't know what you are trying to say, I am going to do my best with it:
Introducing a point of view to someone who would have refused it
if humor had not been present.
That's the best that I can do until I know what you are trying to say. "Whom" replaces the object of the relative clause, but you are replacing the subject of the relative clause above, so it should be "who". In the "if" part of the clause called the "protasis", the past subjunctive should be used; therefore, it should be "were" and not "was" there. I have since changed the example to "had not been", however, after you had explained the statement and its context. "Had been" is the past perfect subjunctive and it is a better choice, I think, for your thesis statement based upon the context you have laid out. Perhaps it could be written the way seen below if you should be talking about something counterfactual in the present time, which I am still not sure is the case:
Introducing a point of view to someone who would refuse it if humor were not present.
I hope that might have helped you out.