The ego builds walls. The collective ego builds the biggest walls. 
Governments, tribes, and religions have a long history of war and conflict and divisiveness. When given more power, they claim they will protect us…that they will eliminate disparities and differences. That they will eliminate the “us and them”.

There is no such panacea through these collectives.

How to avoid this?

Stop seeking perfection through the ideology of a collective.

Start seeking improvement, through yourself and your community.