I've had this happen to me. Crazy ex #2 decided that 6 hours a week raiding (over 3 nights)was WAY too much time away from her and deleted my (at the time) 4 lev 70's.
Now, I'm not a violent guy. I've hit maybe 3 people total in my life from sheer anger and even then stopped after the first hit. But I walked in, saw a note saying "I told you I'd do it". After logging in and seeing no characters, I was so infuriated by the fact that she'd done it, I punched a hole in the wall and threw my mouse because it was the closest thing to me.
I didn't get angry because of the chars being gone, I got them back. I got angry because she betrayed me in the most petty and profane way possible; destroying something I enjoyed as a hobby.
We'd had the whole "You play WoW too much" convo before, but I pointed out to her that this was my equivalent of her watching TV, but she couldn't grasp the concept. She did the whole "One day I'll delete your account" and I replied with something like "Well, I'll sell the TV" and we parted company to cool off. I never actually thought she would do it.
Her reasons for wanting me to stop weren't coherent in any sense of normality. All I wanted was 6 hours a week of alone time to do a hobby I enjoyed.
And before the whole "How did she log in?" thing, I tried to get her into WoW when we moved in together. She played on my account for a while but ultimately lost interest.
So I do know how this guy felt. I can understand the anger. I almost put my fist through my monitor but thankfully I have a LOT of self control. The wall and mouse were much cheaper to repair, so I took it out on those instead.
And yes, I sent her packing the next day. And yes, she took the TV -_-