What action will insurgents take if they cannot persuade locals to support their cause?

Insurgents, when unable to persuade local communities to support their cause, often resort to coercion. This tactic involves the use of threats, intimidation, or violence to compel individuals or groups to comply with their demands or ideologies. Coercion is effective in creating a climate of fear that discourages dissent and fosters compliance among local populations who may initially be indifferent or opposed to the insurgent's objectives.

In contrast:

Negotiation involves dialogue and understanding, which would be less likely if locals are not supportive. Mobilization refers to rallying members for a cause, which would not be necessary if there is a lack of support. Infiltration implies stealthy engagement or penetration of a group but does not directly relate to gaining support through fear or intimidation. Thus, coercion stands out as the systematic approach insurgents would take when persuasion fails.