Dumbledore's bad descisions?

[JoAnna]

No: HPFGUIDX 93923

Earendil:
I suppose Dumbledore's decision could be explained by the protection
we learned Harry could have at Privet Drive, a protection he could
have had nowhere else, not with Sirius or with Dumbledore himself.

JoAnna:
I think it's fairly obvious why Dumbledore sent Hagrid to deliver 
Harry to the Dursleys.  

As far as Dumbledore knew, Sirius Black was the Potter's Secret-
Keeper.  The moment he heard that the Potters had been killed and 
the house destroyed, DD's first thought was, "Sirius Black is the 
spy; he betrayed the Potters to Voldemort."  Obviously, he wasn't 
going to let Sirius Black act as Harry's godfather and guardian if 
Sirius was in league with Voldemort, no matter what James & Lily had 
wanted.  So he put Harry in the Dursley's care instead.

- JoAnna