Could you name some examples from West Side Story and Romeo and Juliet that are examples of these themes?

Question

Haste and lack of wise forthought bring about diaster

The only way some people learn is through suffering

Revengful acts are costly and often do permanent damage.

Also, What is a main theme that incorporates all the above themes?

Here are several sites which address the comparisons between the two stories:

http://www.rit.edu/~423www/performing_arts/comparerj.html

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http://en.wikipedia.org/wiki/West_Side_Story

http://www.yale.edu/ynhti/curriculum/units/1986/1/86.01.06.x.html

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