multicultural competency?

It has been proposed that being able to work with diverse populations is a necessary competency for psychologists that must be actively maintained throughout ones career

Answer the 3 questions below. Attached is an apa reference

What are your thoughts on this position?
What are some potential pitfalls of attempting to work with a diverse population if one is not competent to do so?
How can psychologists go about actively establishing and maintaining their multicultural competency?