In Shakespeare's Much Ado About Nothing, why does Don John not want Claudio to marry Hero and sabotage the wedding?
There are a couple of reasons why Don John tries to sabotage Hero's wedding. One reason is that Don John blames Claudio for preventing him from overthrowing his brother. Apparently, when Don John tried to overturn his brother's rule, Claudio, as Don Pedro's right-hand man, devised some clever tactics to prevent the overthrow and win this civil war for Don Pedro. Hence, Don John would love to get even with Claudio by hurting him in any way he can. The second and main reason why he wants to sabotage Claudio's wedding is that since Claudio and Don Pedro are close, by hurting Claudio, Don John...
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That young start-up hath all the
glory of my overthrow: if I can cross him any way, I
bless myself every way.
Though I cannot be said to
be a flattering honest man, it must not be denied
but I am a plain-dealing villain.
are the key quotations that explain Don John's actions. Don John is a purely evil character, a classic antagonist. He enjoys causing trouble; it feeds his inner satisfaction. Don John has never liked Claudio, and messing with his wedding will prove very satisfying for him. This explains why Don John wanted to cause chaos at Hero and Claudio's wedding.