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Well, for example, it's much easier for third parties (*cough* NSA *cough*) to obtain user's data in bulk from one "cloud service" than from dozens/hundreds/thousands of workstations or SBS's.
Well, for example, some of the victims may become traumatized enough to seek revenge against his/her offenders and do something really nasty... like, say, become a head of NSA or GCHQ and bring demise to the society that allowed said offence in the first place? Hmm...
We all know how this ends - one small boy in a damaged starfighter or one billionaire in high-tech suit with a nuke on his back and this mighty army of yours suddenly turns into a mound of scrap metal. Not to say that an army of machines is often considered evil - in itself or as a tool of some bad guys.
Nope, there's a big difference between "can't" and "don't want to until there is no other option". It's just a path of the least resistance - why spend hours or even days on decrypting some messages when you can just write one letter, receive the keys and read everything anytime you want? But that doesn't mean that they don't have the means of breaking encryption if they really want to.