The best way to cultivate more solidarity within a group is to let them know that they have enemies and that those enemies are threatening them every single day. When they have no one outside to attack or when they have been convinced that they are their own worse enemy then they will attack each other. They won't have sympathy and compassion for each other. In fact they will see each other as their enemies instead of seeing the people who put them all in that situation to begin with as their "true" enemies.
But when they begin to see that all of them are being played by the same puppet master. When they believe that they are being threatened in some shape, form or fashion by the same group. When the evidence of their mistreatment is constantly layed before them on a day to day basis. When they focus on the things they have in common rather than the things that make them different. When they realize that no other group will truly accept them as their own and that the only group that will accept them and love them is their own. When they choose not to accept the definitions of themselves that their enemies have given them for the sole purpose of making them more hostile towards each other, then they will work together to see that they are no longer in danger of being mercilessly exploited by their crafty, manipulative assailants.
They will begin to see that they have been bickering and arguing about issues that their enemies instigated and started in the first place. They will begin to see how their lives and relationships have been completely distorted by their enemies desire to see them divided against each other. And because they now see how they have been duped into fighting each other, they will now want to make sure that all of these things never happen again. And they will also want to live lives that are governed by themselves as opposed to being governed by another group of people. They will seek to control their own images of themselves. They will create their own standards of living that are acceptable to them. They will seek to define themselves in a more loving and humane way. They will seek to build more unity amongst themselves because they will realize that's the only way to stop others from controlling them and outsmarting them.
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