The range of opinions is probably healthier than homogeneity. I think labelling people extremists and pushing them towards the centre would be pretty dystopian.
What is easier to change than people's opinions, is the two party political system which tends to resolve such questions to one of the two extremes based on one side achieving a tiny majority, rather than to the average which is usually a lot more sensible.
What is easier to change than people's opinions, is the two party political system which tends to resolve such questions to one of the two extremes based on one side achieving a tiny majority, rather than to the average which is usually a lot more sensible.