Tradition
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When somebody learns their community's traditions they are given that sense of belonging.
What we really need to do is share our traditions, because by sharing our traditions we could prevent these unshakeable extreme views of people, because we get to know each other. We all get a greater sense of understanding of who we are and who our neighbours are and instead of living in fear we're able to accept them and even adopt some of their traditions as our own.
Traditions give us a sense of identity and identity is what helps us define our community. That's what makes us feel good and gives us the strength to survive.