It is easily concludable that Romeo is the main cause of many problems in Romeo and Juliet for many obvious yet overlooked reasons- the main character flaws of Romeo are his desperocity to find his true love, his over-impulsive and dramatic attitudes in bad situations, and his decision to show up to his enemy's party uninvited. We can draw that it is important to act rationally in situations of danger (and in every-day life) from the fatal character flaws of Romeo.
Clearly, Romeo's most fatal flaw is his tendency to act impulsively and dramatically in negative situations without considering the consequences. We can see this flaw of his most clearly when he danced with and kissed Juliet, when he killed