What is Paris' fatal flaw in romeo and Juliet?

The idea of a "fatal flaw" is much like the "tragic flaw" which the somewhat rigid and artificial theory of tragedy advanced in Aristotle's Poetics demands as a characteristic of a true tragic hero. Paris, however, is not by anyone's definition a tragic hero, and so there is no reason why we should go looking for a fatal flaw in him. However, for those people who insist that if someone dies, it must be because of some "fatal flaw" in their character, we can only note that Paris meets his demise while paying his respects to his deceased fiancee, at which time he spots Romeo, a notorious Montague who has been banished from Verona, hanging around the tomb. Rather than notifying the city watch of the presence of this outlaw, and leaving the enforcement of the Prince's decree to those best suited to do so, Paris, despite Romeo's warnings to "tempt not a desperate man", attempts to apprehend Romeo. In the fight which ensues, Paris is quickly dispatched. The only flaw which can be said to have led to this fatality is the one which led Paris to make this ill-advised decision: his inability to judge when it is inappropriate to try to make a citizen's arrest.