When I was growing up and serving, the Irish was a threat to my security, especially when they blew up a bomb 60 yards from me in Oxford street, or decided to plant a bomb in Suvla barrack block .
Then it was Iran that was a threat, then Al Quaeda, now islamist fundamentalists.
We live in a world of threats & conflicts, where anyone with a weapon thinks they are right. We went into Iran on the lie of 45 minutes away from destruction. Those poor innocent souls on the plane over ukraine fell fould of being in the wrong place at the wrong time and a trigger happy missile commander.
End of the day, it isn't a race, a religion, as a whole thats the threat. As always it's a few fanatics with blinkered views dragging others into their fight.
The trick is not to fight them with your own radical fanatical view. Two wrongs don't make a right. Treat them as the criminals they are, and we have laws to deal with that, plus, thanks to the IRA, quite a lot of experience with dealing with these on home soil.