Why should we have simcha in Adar?

In shul yesterday morning Rabbi Wein asked a great question: why should the month of Adar be greeted with the slogan mishenichnas Adar, marbim besimcha (Ta'anit 29a: "When Adar comes in,we increase simcha")? If it's because God performed miracles for us on Purim, haven't we picked the wrong month? Adar is followed immediately by the month of Nisan, when God performed far more miracles for us--and bigger ones too. Shouldn't we be told to increase our simcha (whatever this hard-to-translate word truly means) in Nisan instead?

Quoting Rabbi Tzadok HaKohen, Rabbi Wein offered us an answer. Yes, God did amazing miracles for us in Nisan, not least of which were the Splitting of the Red Sea and the single-handed destruction of what was at the time the world's most state-of-the-art army.  But what were we? Nothing but an appreciative audience, passengers if you like, while God did everything on our behalf. In the story of Purim, however, we see that God's intervention was behind the scenes, leaving us the opportunity to play a part in the turn of events that led to our salvation. 

The point is this: there is more simcha to be derived from something that we have had a hand in, because we were part of the resolution of the problem. We were participants in Purim--and participation, doing something ourselves, is the source of real simcha. Of course we were hugely grateful for the miracles of Pesach and we remember them every year. And to commemorate our participation in the Purim miracles, we have been given a festival based on participation and involvement: we have the mitzvot of mishlo'ach manot and matanot le'evyonim. 

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Those of us who are fortunate enough to have brought up children, or to have taught them, will know the empirical truth of Rabbi Wein's words. A small child will generally derive much more satisfaction from being able to do something for himself than if that same thing is done for him by an adult. And some of us are blessed with the ability to derive pleasure from doing things for ourselves even when we are no longer small children.