consider the following scenario and post your opinion on the question:

The Toronto chapter of a motorcycle gang was not complying with instructions from the US headquarters and the Winnipeg chapter was instructed to take care of the issue. Members of the Winnipeg chapter invited the Toronto chapter to a remote farm under the pretense of discussing business. The Winnipeg chapter prepared for the meeting by cleaning their firearms, putting on gloves, establishing radio communication between members and monitoring police scanner. Once the Toronto chapter arrived, the Winnipeg chapter rounded them up and killed. Marcelo and Frank guarded the victims in the barn, while Michael, Dwight and Wayne led them outside and executed one by one. Brett was present at the scene but neither helped guard the victims nor execute them. However, he knew of the whole plan in advance and was monitoring a police scanner. Should all members of the Winnipeg chapter be held equally responsible for the murders or should their responsibility vary, depending on the role they played?

Remember the 'netiquette'.