Final answer:
The two themes are the gun control debate and the public perception of safety, involving discussions on firearm accessibility and the influence of media coverage on the public's sense of security.
Step-by-step explanation:
The two themes that have emerged in recent years due to the numerous active assailant incidents around the country are gun control debate and public perception of safety. The gun control debate involves a contentious discussion on the accessibility of firearms, with advocates for stricter gun control noting a relationship between access to guns and mass shootings, and gun rights advocates arguing that access to guns is incidental and emphasizing the right to bear arms. In terms of public perception, the extensive media coverage of these events has been found to skew people's perceptions of the crime rate, making them inaccurately high and increasing fearfulness of experiencing crime or terrorism.