The answer to this question may depend on the talent of each individual. It is always a good idea to try to broaden our topics as we do not want to be perceived in some cases as one topic individual. Our experiences and our talents will dictate whether we are a one topic individual or can address a mutiple issues and topics.
We all tend to learn from our experiences and always have a view on issues important to us and to others. Addressing these topics in a way that explains our perspective on how and why we feel the way we do will increase our perception with those who read our material.
I find there are many topics which surface sometimes on a daily basis for which I feel strongly and I express my views through my writing. This is how we become better by not limiting our writing perspectives but expanding them. Sometimes we may feel uncomfortable with certain topics but the more we address them we become more comfortable and can better express our views which may or will agree with others. The main point to remember is the views we have are not limited to us but can be seen in the many polls taken on various issues.