Why did Spanish missionaries continue their work in East Texas and on the Plains when many people there resented them?

Answer 1

Since when are missionaries overly concerned with the welcoming committee? They view themselves on a divine mission.

Answer 2

Perhaps they believed they had more responsibility to God than to people? Did they have a duty to bring the Catholic Church to Protestants and the unchurched?

Along the same line -- why do American missionaries today go to New York and Spain?