One of the best ways of conflict prevention is attitude change.
There can be no conflict if you are not conflicted with yourself. If you assume a clear and flexible attitude, if you clearly see your goals and have the courage to make choices decisively, conflict avoids you by a wide margin.
Even if other people come looking for trouble (someone who enables them to play out their own inner conflict), you can be calm like the eye of storm.
If you want to help others to prevent their own conflicts, communicate. Showing them a solution might help them - or it might enrage them further in case they are unable to live without their beloved conflicts.
Conflict prevention is easy to do for yourself - almost impossible for others.