Dumbledore, Hagrid & Sirius -- no warnings?

[A. Green]

No: HPFGUIDX 14978

Thinking about the whole Sirius thing now.  If Dumbledore thought Sirius was 
secret keeper.  V. finds Potters so secret betrayed. Sirius sees Hagrid 
right after the murders.

If Dumbledore thinks Sirius is the traitor (no matter how much he wants to 
deny it, what else could it be, right?), why doesn't he tell Hagrid, 
"::cough, ahem (e.g.):: You may want to let Sirius get another cycle." or 
"::cough:: Sirius isn't likely to need it any more."  when (in PS/SS Chapter 
1) Hagrid says that he's off to find Sirius and give him back his 
motorcycle?  Even if he wouldn't say, "that traitor doesn't deserve...."

If this has been covered, please point me to the thread.
a.
(who has lost yet another owl to forces unknow)

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