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

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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Both West Side Story and Romeo and Juliet touch upon the themes of haste and lack of wise forethought bringing about disaster, the idea that the only way some people learn is through suffering, and the consequences of revengeful acts.

In West Side Story, the theme of haste and lack of wise forethought leading to disaster is evident when Tony and Maria fall in love at first sight and rush into a relationship, despite being from rival gangs. This ultimately leads to tragic consequences as their impulsive actions result in violence and death.

Similarly, in Romeo and Juliet, the theme of haste is central to the story. The eponymous characters meet, fall in love instantly, and marry in secret, all within a matter of days. Their impulsive decisions and haste to be together eventually lead to their tragic end.

The idea that some people only learn through suffering is portrayed in both stories as well. In West Side Story, the characters' involvement in violence and the consequences they face force them to realize the consequences of their actions. In Romeo and Juliet, the families' feud and the tragic events that unfold serve as a painful lesson for the characters involved.

The theme of revengeful acts being costly and causing permanent damage can be seen in both stories. In West Side Story, the gang rivalry and the characters' desire to take revenge on each other result in heartbreak, destruction, and loss. Similarly, in Romeo and Juliet, the revenge-driven actions of Tybalt and Romeo lead to a chain of events that culminates in the deaths of several characters.

As for a main theme that incorporates all these themes, it could be the idea that love can be both beautiful and destructive. Both West Side Story and Romeo and Juliet explore the intense and passionate love between individuals from rival groups. While love brings joy and connection, it also leads to tragedy and the destruction of lives. This overarching theme highlights the complexities and consequences of love, as well as the powerful forces that can arise from it.