Socrates is mortal. I am a woman. I am brilliant. Every argument, whether constructed deductively or inductively, relies on the syllogism in order to make sense. Go through the paper with the writer and try to find out what the he is really arguing by unearthing the syllogisms buried in her prose.
Abortion is murder.
Abortion is wrong. A writer will need to consider, in this case, the terms he is using. Both matters must be addressed by the writer if he wishes to make an argument along the lines of the one suggested in the syllogism above. In this case, the writer is suppressing assumptions. One legitimate reason for suppressing an assumption is that your readers can be counted on to agree with what you have to say.