...
Approach 1 is exclusive but clear. Also it requires a high degree of clarity and honesty. If someone is classified as willing to use violence, that person gets avoided, alienated and excluded. Changes in personal behaviors of the avoided one are not taken into account. A person once classified as dangerous will not be reintegrated into the social circle of the individual following this approach, therefore the excluding person is perfectly safe. It will be hard building a group following this approach, because most people are not able to behave in such a controlled manner and would therefore be avoided. But if a group of people was to be built it would almost certainly succeed.
Approach 2 is inclusive but vague. Also it requires a high degree of empathy and great language skills. Noone gets actually classified, because escalations of communicative situations are avoided. Therefore there could be bad surprises of violent outbreaks if someone gets triggered by something unexpected. But changes in the personal way of people dealing with violence can also be achieved through collaborative work and will be recognized. A group could be built much faster and would consist of people whith with issues, who are willing to figure them out together. This group would have a higher chance to fail.