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0e1f616
(Get the code!)
Jessie,
One reason not to turn it on by default is that it runs some risk of the user's data being entirely unrecoverable - leaving aside the possibility of bugs in the software, users do forget passwords, etc. There are plenty of reports of people running into similar problems with NTFS encryption. Different people will have different preferences for whether they'd rather run the risk of losing access to their files themselves, or of someone else seeing them if they gain physical access to the machine.