That is because they are completely different cases with completely different mechanisms to prevent them. You're talking about the ability to load a spambot or something on a mobile device. The encryption is there to ensure your address book is safe, your calendar is safe, any photos and other data are safe. Not to ensure the device does not run arbitrary code. The problem with the data encryption being crackable within an arbitrary length of time is a large issue, as it is meant to be protection regardless of where the device lies, in hands or not.

That is exactly the purpose of encryption.

enÂcrypt (Än-krÄpt) tr.v. enÂcryptÂed, enÂcryptÂing, enÂcrypts

1. To put into code or cipher.
2. Computer Science To alter (a file, for example) using a secret code so as to be unintelligible to unauthorized parties.
http://dictionary.reference.com/browse/encryption

So yes, it is a major issue, as it circumvents what the encryption is meant to accomplish.

Sadly it does not, windows only, and they claim IE8 only as well, but I didn't try the installer to check.

At least the way I see it, it's not a case of "taboo" and more just a general lack of desire; to me it's a sign of affection, albeit a less personal one. Just like I wouldn't hold hands with a woman I'm not in some kind of serious relationship with, or at least have a great deal of affection for I wouldn't hold hands with a male friend. Maybe there is some of the "it makes you homosexual" to hold a man's hand in there somewhere, but I think the way I was brought up and the way most people I know were brought up it's more that it's reserved as a sign of affection. (Canadian, maybe us Canadians are just weird, I don't know)