The Superiority problem

Ideology:
All other religions are inferior to Christianity

Result:
Crusades

Ideology:
Africans are inferior to English

Result:
Slavery

Ideology :
Other races than the Aerian race (Germany) are inferior/do not count esp Jews

Result:
Holocaust, genocide

Ideology:
Animals are inferior to humans

Result:
Animal abuse, animal testing etc.

Ideology:
Women are inferior to men

Result:
Misogyny, unequal rights (cannot vote, work, go out without total coverage in some countries)

Notice  a pattern?