why do you think hannah felt that "thinking dangerous" in this place

Things are out of control and the women are powerless. To think would be dangerous............ immediate action was all important, and thinking could get you into trouble or even worse allow you to be caught off guard.

The women are naked here........... strangers are taking their clothes, shaving their heads, and adorning them in rages. Children are being separated from their mothers.......... there's nothing to think about; thinking could make them crazy.