As a good example, you can move your living room furnature all around the house on shabbat, and you won't be in violation. When you move the furnature, it never leaves the house, so you never perform melacha, even though there is quite a bit of avodah. But when you move the paper from outdoors to indoors, you perform melacha, even though there is almost no avodah. As peace loving people we must condemn violence of every kind. Whether the senseless killings in Israel, the malicious attack on innocent Jewish students in New York, or the firebombing of a peaceful Rabbi's house in England, acts of violence must cease.
Violence begets violence.
Attack begets attack. It is time for the madness to stop. It is time for the pain to stop. It is time for all people to cry out for an end to these acts. It is time for all people to cry out for peace.