Is it the duty of the government to preserve a nation's traditional values, or should that be left to individuals?

Yes. The government should preserve traditional values.

Tradition and values change over time. It's been happening in the history of every country. I would not prefer a swift, drastic and enforced change.

Culture and tradition has changed and will change for all time, it’s silly to try to sustain a single, rose tinted version of an idealized past.

The government represents the people, let the people decide what they want their values or traditions to be.

I think the government still does have some duty in it as much as the individuals do. We want to keep some of the national traditions that are beneficial to all.

Individuals. As we grow, we must be able to adjust our constitution. If we cannot do such a thing then we will be trapped in the past. It's ok to want to follow the beliefs of the framers of a country but it's not ok to morally support decisions made centuries ago.