  The dynamics of spreading of the minority opinion in public debates (a reform
proposal, a behavior change, a military retaliation) is studied using a
diffusion reaction model. People move by discrete step on a landscape of random
geometry shaped by social life (offices, houses, bars, and restaurants). A
perfect world is considered with no advantage to the minority. A one person-one
argument principle is applied to determine locally individual mind changes. In
case of equality, a collective doubt is evoked which in turn favors the Status
Quo.Starting from a large in favor of the proposal initial majority, repeated
random size local discussions are found to drive the majority reversal along
the minority hostile view. Total opinion refusal is completed within few days.
Recent national collective issues are revisited. The model may apply to rumor
and fear propagation.

Disordered Systems and Neural Networks;Statistical Mechanics