On writing about your opinion:

When
you are asked for an opinion, it should not be “off the top of your head.”
Instead, examine the subject carefully and support your assertions with
evidence.
Consider the following example, and apply similar methods in other instances:
Asked about your opinion of Columbus, your first impulse may be to say, “Columbus
committed genocide.”
What is the evidence?
- The
definition of genocide is: the
deliberate and systematic destruction of a racial, political, or cultural
group, [From the Merriam Webster New Collegiate Dictionary online]
- Columbus
represented the Spanish crown at the end of the 15th century.
- Columbus
enslaved or kidnapped a number of Indians.
- Columbus
appropriated land and goods that belonged to Indians.
- Columbus
recoded some opinions of the Indians to the effect that they might become
good servants.
- Members
of Columbus first crew, who remained behind when he returned to Spain,
committed so many atrocities that the Indians killed them all.
- Columbus,
those who traveled with him, and those who supported his expeditions,
thought that Indians should be converted to Christianity, by force if
necessary.
- Those
who came after Columbus (Cortez, Pizarro, etc.) subjugated large Indian
populations by violence, killing many.
- A
great majority of the Indian population died as a result of diseases that
came to the Americas with the Europeans.
- The
priest Las Cases condemned violent treatment and enslavement of the Indians.