There is nothing wrong with having strong opinions but always remember this doesn’t mean you are right. There is a difference between a fact based opinion and experiential opinion. In one case you are actually using hard facts and objective data to state you position. In the other case, you are relying more on subjective experience and personal beliefs to make your point. The dangerous thing about experiential opinions is that they are grounded solely on the personal filters of the advocate. They are also based on a singular and usually somewhat stunted view of reality. Being louder and more passionate about something will certainly garner attention, however, once again this doesn’t mean you are right and very often means you are rude, close-minded and/or a poor listener.
In life and business, everyone has an agenda and that is OKAY. In fact, it is to be expected. Most people live their day to day existence in a subjective mindset.