What is the purpose of presenting a false dilemma in a speech?

When only two choices presented yet more exist, or a spectrum of possible choices in between.

convince the audience that there are limited options.

Explanation:

The false dilemma is meant to present a limited number of alternatives - most often spoken as if there were only two - when in fact there is more. This fallacy is linked to a limited and simplistic view, which does not take into account the multiple variables and contexts involved in a situation.

Fallacies such as the false dilemma can be used on purpose to manipulate opinions, but it is much more common that they occur by accident, without this bad faith: none of us are free to commit this kind of error, either by lack of attention, lack of knowledge or lack of time to think better about what we are saying.