How does logic help to form a good argument? It tests the emotional impact of an argument. It determines whether or not an argument is true. It indicates whether a premise is an opinion or a proposition. It analyzes the structure of arguments.
In general, logic helps to form a good argument because "It determines whether or not an argument is true" Without logic, an argument has very little credibility.
The answer is: "It determines whether or not an argument is true"
Logic allow people to present argument with proper method of reasoning based on collections of valid/trusted data. This allow people to see whether a certain argument is actually represent the truth that exist in the real world.