1. Getting the reader to relate to your views somehow
2. Diminishing the opposing view's points and making it clear that your point is even more valid.
3. Lastly, getting the reader on your side.
The hardest goal to achieve is #2 because depending on whether or not the opposing view is directly targeting you it can be hard to try to avoid their evidence if you can't even think of evidence that would help defend your views.
The sentence is an example of a cause and effect reasoning. It helps to stablish the relationship between an event that comes first, and the one that takes place after the former. This type of reasoning provides the necessary information and details to understand why certain events happens as they do.
