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You could anyone to blame and be correct, but for the instance of Romeo there are plenty of way to start you essay.
For example you could start it with bringing up how he went to the Capulet's knowing that only trouble could come of it. Or you could start by bringing up how in love he was with Rosaline before he cast her aside for Juliet. Or how he came back to Verona after having been sparred by the king.
Whatever you choose it must be dramatic, for example you could start with "In Romeo and Juliet there is only one murderer, one murderer who can be put to blame for every death, who could have prevented every death and with his own hands kills more than one. This vile person I speak of is none other than the lover boy Romeo!".