On the Importance of Setting Up Quotes

Consider the difference in the following introductions for the same set of facts:

The Guardian site documenting the number of people killed by American police shows how dangerous it is to be a law enforcement office in the United States.

The high number of unarmed people (or those with non-firearm weapons) killed at the hands of American police, as documented by the Guardian, suggest that police use of force needs to be more closely monitored.