I read Signal Zero some time around 1982. It profoundly affected my thinking about the effect of environment on thinking and reasoning. I believe its message is more important than ever today, as we address the issue of police violence.
Kirkham's book did not cause me to condone police violence, but it absolutely did help me understand how and why police officers are changed by their working environment. I believe that understanding is absolutely necessary in order to address the problem, which is in no way new.