Which of the following have NOT been targeted or plotted against by terrorists or violent individuals?

The selection of "None of the above" as the answer suggests that all the listed options—public infrastructure, places of religious association, and sporting events—have indeed been targeted or plotted against by terrorists or violent individuals. This is a significant point for understanding the broad range of targets that may be considered vulnerable to terrorist acts.

Public infrastructure such as transportation systems, utilities, and government buildings has been a focus for terrorist attacks due to its symbolic value and potential to cause widespread disruption and fear. Likewise, places of religious association often serve as targets because they represent specific ideological beliefs and can invoke strong emotional responses, making them particularly impactful targets for violent acts.

Sporting events attract large crowds and are often viewed as festive occasions, which can amplify the shock and horror of an attack, thus making them appealing targets for those looking to instill fear or gain attention for a cause. Numerous incidents have occurred in this realm, emphasizing the importance of vigilance.

By indicating that none of these areas are exempt from being potential targets, the answer underscores the need for comprehensive awareness and preparedness against a wide array of risks posed by terrorism and violent extremism. Understanding this helps in fostering a proactive approach to security in varied public domains.