Answer:
What is it called when someone assumes that in order to understand an issue it needs to be looked at by only two sides?
False Dichotomy: It gives the impression that the two opposite options are mutually exclusive (that is, only one of them may be the case, never both) and that at least one of them is true, that is, they represent all of the possible options.
Step-by-step explanation:
Someone is using false dichotomy when he thinks he can understand an issue by only looking at two sides of it. This means he believes only two options are possible for that issue. He also believes that only one of the options is the true one, which leads him to exclude the other option completely. The problem with false dichotomy is that it limits a person's perspective on an issue. There are usually more than just the two options presented as valid. Also, the options are not necessarily mutually exclusive - sometimes, they even overlap.