That is a false dichotomy. It is like saying "all men are created equal, but some should be made more equal than others". By definition a democratic republic will end up with mostly representatives that reflect the majority view, unless you legislate that minority views are somehow worth more than the majority view to make things "equal". I agree that minorities need to have representation that can help protect their interests, but not at the expense of anyone else's interests. But therein lies the rub, especially with groups with conflicting interests (religious/atheist for example).
The aim of good government should be to ensure that minorities whatever they may be do not suffer disadvantage due to membership of that minority group. Its not about promoting their interests but more protecting them from being disadvantaged by the majority. Most states have something along the lines of a Human Rights Commission, and a body of law that penalises discrimination. For the most part these cases are hard to prove and organisation like the HRC are toothless tigers.