Re: surely trying to kill someone in a business quarrel isn't terrorism?
When the police are alerted to a bomb threat, do you really think that they assume it's not a terrorist ? What reason would they have to do that ?
Knowing how to make a functional, deadly bomb is not something that is common. Hell, actual terrorists have been known to foul it up. So when you do discover a bomb somewhere, your first thought is certainly not "oh, this is just from some bloke who didn't like how the helldesk drone handled his call".
A bomb is terrorism, it is not just violence. Frankly, I think he got off light. He has the skills, and lacks the restraint. I'd have sent him down for the maximum.