So-called Protestant Christian blows up Catholic Christian in Northern Ireland. So-called Orthodox Christian rapes Catholic Christian in Serbia. So-called Catholic Christians annihilate Reformed Christians in France. Whenever we lend God's name to hateful, violent, bigoted, destructive causes, we make wrongful use of the Lord's name. We break the Third Commandment when we maliciously bring harm in a curse.
Words can hurt.
They do have power. We tend not to take curses very seriously in our age. But words can either bless or curse. Ask any child who has been told repeatedly that he or she will never amount to much. Some curses, however, attempt to employ God's power through his name, and that kind of curse is doubly wrong.