As a CIED guy, this stuff makes me feel more helpless and frustrated than otherwise.
I'm also frustrated. And sad for the people in Manchester, as I was for the lost souls in London and Paris, etc etc.
Unfortunately, politicians, police and media give these perpetrators a convenient label: 'terrorist'.
In truth, their actions will not bring down a government or leadership; therefore, they cant be defined as terrorists.
They are just delusional bastards, who are never going to amount to anything in their miserable self centred lives.