So basically, that's the exact opposite of what really happened. And you're so right.
A couple things strike me about this. First of all, if we put bullets through every computer used to post whiny, self-absorbed rants to social networks, we'd run out of computers faster than China could build new ones.
Secondly, if this is indicative of how the father reacts to parenting challenges, perhaps the daughter is entitled to the occasional privacy-locked rant.
Third, he violated her privacy, pure and simple. This is no different than breaking the lock on her diary and reading the contents on the NBC Nightly News. Except that Tom Brokaw wouldn't allow guns in the studio. Everyone needs a protected space where they can vent their frustrations, anxieties, dreams, idle musings, etc where they have a reasonable expectation of control over their intended audience and privacy. He had no right to read what he sought out. She's 16, and that's old enough for her to have sovereignty over her own thoughts and feelings.
The gun violence against the laptop is very symbolic. To me, it's very clear that her (private) speech has enormous consequences. She would not be wrong to compare her situation to living under a brutal dictatorship.
The other thing is, he's a parent of a 16 year-old. He states she's been grounded for three months. Ok, but how much longer are you going to be able to ground her for months on end? And what lesson are you trying to impart? Because I don't think this current strategy is effective for anything other than alienation. Because as soon as that kid gets out of the house, she's never looking back. It's no wonder there's no respect from the kid when there isn't any coming down from the "adult" in the relationship.