2432.2 Assessment
Research Question (Clear, unambiguous) "Research Question: Frustration may result in aggression when an event is perceived  as a threat to one’s ego, where the act of aggression will be displaced on individuals that have no personal role in the other individuals shortcomings. "  Unfortunately, this is not a research question as stated.
Relevant Literature There is a huge literature on frustration and aggression, so it is not possible to move forward in any way on this issue without some knowledge of the literature.
Causal Interpretations (clear, all parts defined, mechanisms, controls, plausible) These causal statements won't really work.  "Mental disorders" in general do not predispose people toward violence; only some do this.  Frustration is such an amorphous concept, it is not really sensible to suggest that the poor will feel more generally.  
Data (variables, sample, comparison) Again, the data sets mentioned do not seem appropriate for any research design involving this topic.
Research Value Given that the levels of violence have dropped considerably in the U.S. over the past two decades, it does not make much sense to base the claim of research value on rising aggression in this country.
Overall Frankly, this just does not make much sense.