They're just Keyboard Warriors who usually only type with one hand. But, the threat HAS to be taken seriously until it can be firmly established without doubt that it was just talk.
It's another sign of the times that personal protection services is a growing industry being fed by the cuts in funding to police forces. There's a huge market now for well trained Close Protection Officers (CPs).
Interesting though that the papers announced the 'top secret operation' to provide protection on their frontpages.