Avoid rhetorical questions
A rhetorical question is a question asked not as a genuine inquiry but rather to suggest something or to make a point.
An example of such a question is:
Who could disagree with the statement that our political system is effective?
What the questions suggests is that “No intelligent person can dispute that our political system is effective.”
There are a few problems here.
The main problem with this type of question is that almost always there is someone who will answer in a way you don’t anticipate. Another issue is that often such questions are used in place of careful argument, and they are a poor substitution.
Finally, they take up more space than it would take to simply state the point, and they lack the clarity and conviction of a good declarative statement.