Re: surely trying to kill someone in a business quarrel isn't terrorism?
"Knowing how to make a functional, deadly bomb is not something that is common."
Not common to know how? Maybe in your nanny state, but not mine ... I just asked the 16 adults currently on the property. All know how. Fortunately, all are sane and will not. I've made and used ANFO (for stump blasting, quite legal). Most of us have set off fireworks. Ever mix vinegar and baking soda? Etc.
Seriously, it's not rocket science. Literally ... rocket science involves making it NOT blow up!