ON VIOLENCE by Hannah Arendt. 106 pages. Harcourt, Brace & World. $4.75.
REBELS IN EDEN: MASS POLITICAL VIOLENCE IN THE UNITED STATES by Richard E. Rubenstein. 201 pages. Little, Brown. $5.95.
Hannah Arendt opens her essay on violence by launching an attack on the think-tank methods of "scientifically minded brain trusters." The trouble, she points out, "is not that they are coldblooded enough to 'think the unthinkable,' but that they do not think."
That is the last thing anyone would say of Hannah Arendt. She thinks and thinks. Moreover, the quality of her thought is...