> If you shout your friend's email in a hotel's lobby, you wouldn't blame the hotel, right?
No but your friend would be quite in the right to blame you if they got threatening emails as a result of it. Depending on whether actual harm came from the act and whether you shouted their email with an intent to cause harm (even a different harm like a cascade of d** pics) then you could be held liable for damages.
If you act in a manner intended to cause harm and harm results - even if not in the manner you intended - then you can be held liable. Greasing a sidewalk so that folks will fall on their ass for the giggles and then causing someone to break their spine still leaves you liable for damages - even if you were unable to foresee the potential outcome of someone breaking their spine.
The hotel lobby example is likely to not result in liability due to difficulties in showing you acted maliciously but there certainly is a possibility there.