Why is the nurse in Romeo and Juliet to blame for their deaths?

The nurse is partly to blame for the deaths of Romeo and Juliet, because she encouraged and enabled Juliet to see Romeo.  

I would like to say that I don't think that the nurse is the only character that deserves blame.  Ultimately, Romeo and Juliet are most to blame, since they both committed suicide.  Friar Laurence also deserves a great deal of the blame.  As for the nurse, she encouraged Juliet to secretly meet...

The nurse is partly to blame for the deaths of Romeo and Juliet, because she encouraged and enabled Juliet to see Romeo.  

I would like to say that I don't think that the nurse is the only character that deserves blame.  Ultimately, Romeo and Juliet are most to blame, since they both committed suicide.  Friar Laurence also deserves a great deal of the blame.  As for the nurse, she encouraged Juliet to secretly meet with Romeo.

I must another way,
To fetch a ladder by the which your love
Must climb a bird's nest soon when its dark.

She covered for Juliet, and she sent letters to Romeo for Juliet.  I admit that the friar probably deserves more of the blame, especially since he performed the actual wedding; however, without the nurse's help, that wedding likely would not have occurred.  

Furthermore, the nurse knew about Juliet's love for Romeo, yet she began pushing Juliet to marry Paris.  This resulted in driving Juliet to seek more desperate measures to be with Romeo.  

Romeo is banished, and all the world to nothing
That he dares ne'er come back to challenge you,
Or, if he do, it needs must be by stealth. 
Then, since the case so stands as now it doth, 
I think it best you married with the County. 
O, he's a lovely gentleman!

I often think that had the nurse helped Juliet escape with Romeo to Mantua, they both might still be alive.