Why do you see that as terrorism?
> TERRORISTIC THREAT > > (a) A person commits an offense if he threatens to commit any offense involving violence to any person or property with intent to: > > 2. place any person in fear of imminent serious bodily injury;
Terrorism used to mean violence or a real threat of violence committed for political reasons. Now it just means any crime committed by someone whose motives (or whose ethnic group) the speaker disapproves of.
Are they? There are plenty of other ways to do that without (pardon me) going nuclear. Many death threats go so far as to include someone's family, friends, and other acquaintances. If it's mere dissatisfaction being expressed, why go that far if not to put someone in fear?