Consideration of all viewpoints provides a more rounded view of the issue, leading to a better decision. And a decision supported by everyone will avoid resentment, division, and efforts to undermine it. If the group fails to accommodate your viewpoint after fair effort, ask yourself if you feel strongly enough to uphold your position. Refusing to do so might paralyze the group. Also, consensus does not give everyone an equal voice.
Some people know more and care more about an issue.
Naturally, their views should carry greater weight. Try not to make it worse. Before you speak, ask yourself whether your statement is worth the group's time. If someone else has said it, you may not need to. If time is short and the group is large, a matter may need to be turned over to a smaller group.