The ability to help others in distress is extremely important in preparing and equipping to survive as a community. If my psk / bob equipment and survival training helps me to live through a situation or social collapse or even short-term disruption then I may live through the situation only to find that what I return to is not worth the trip. I think that in this arena the training and knowledge is even more important than in the case of individual survival. Only in a true wilderness situation are you likely to find another individual in distress who doesn't also bring with them some equippement. Good knowledge on trauma first aid and other SAR technique combined with a macgyver approach to imporvisation can help an individual to utilize the resources that they have and help them to live another day. Accomplishing that type of aid for others will naturally place you in a position of leadership. Once in a position of leadership you will need knowledge and training of how to organize teams for larger goals and how to accomplish larger tasks. If you are trying to survive individually you probably won't need to know how to build a bridge. OTOH if you have a major quake and are totally cut off and someone needs to get out, some basic structural engineering will come in quite handy once you have a team of enough individuals to lift and position large beams or tree trunks. I am sure that there are other scenarios that will require squad level numbers of people and the training to know what to do with them.

Skills I would consider helpful in helping others

EMT Basic

Wilderness SAR

Structural evacuation and stabilization

Radio repair and use

Auto repair and maintenance

Basic log structures

Basic smelting and smithing