The biggest problem was that of the officers towards the non-violent protesters who were sprayed with tear gas and pepper spray. Incidents such as the ones mentioned above are obviously towards the public and not law enforcement. Officers may still experience personal problems after large media events like these because they might feel personal blame. Violence is prevalent in media, both towards the public and towards the law. They also mentioned that during incidents, a gun carried by the cop might end up in the hands of the offender.
Many time cops hold back, and sometimes at their own expense.
A cop who just received a course on violence is less likely to pull the trigger of his gun. Research has shown that many officers never pull the trigger for self-defense in their entire career. One major effect from critical incidents and from violence is post-traumatic stress disorder. Officers can become moody and irrational. Many have trouble sleeping and behaviors change.