Social exclusion is usually driven by greed and prejudice. Excluding others ensures your group has access to more of the resources you want with limited competition. A social understanding of exclusion is relatively new, and we lack statistical data on its pervasiveness, but Canadians are becoming more aware of it.
Racism can be the basis for social exclusion. The anti-racism protests in 2020 called for changes to policy that disproportionately disadvantaged people of colour, especially related to the justice system. The policies they pointed to are a form of social exclusion.
Without access to resources, individuals fall into poverty, which contributes to poor physical, mental, and emotional health, family violence, addictions and substance abuse. Additionally, without equal access to centres of power, those who have been excluded have no ability to advocate for change through official systems and structures. Activism, protest, and social unrest are seen to be the tools available to them.