Among all these adults, many of whom have known Harry for several years and should know that the boy keeps getting in trouble simply because he tries to find out things he's not told, Sirius is the only one who wants to inform Harry about what's going on.
Word. Sirius takes a lot of flak, both from the other characters and from the fans, for being reckless and irrational in OotP, and at times he is, but he's also the only adult in the book who wants to keep Harry informed and included in what's going on, while everyone else wants to keep Harry ignorant and isolated -- something Dumbledore himself eventually acknowledges as a mistake. Sirius may not have done a great job of being a mature and sensible parent figure for Harry -- a man who spent most of his adult life in a brutal prison is really not equipped to parent a troubled teenager -- but he's the only adult in Harry's life who genuinely *tried*.
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Word. Sirius takes a lot of flak, both from the other characters and from the fans, for being reckless and irrational in OotP, and at times he is, but he's also the only adult in the book who wants to keep Harry informed and included in what's going on, while everyone else wants to keep Harry ignorant and isolated -- something Dumbledore himself eventually acknowledges as a mistake. Sirius may not have done a great job of being a mature and sensible parent figure for Harry -- a man who spent most of his adult life in a brutal prison is really not equipped to parent a troubled teenager -- but he's the only adult in Harry's life who genuinely *tried*.