Liberté. Égalité. Fraternité.
"No religion is true, but some religion, any religion, is politically necessary. Law and morality are insufficient for the large majority of men. Obedience to the law and to the morals are insufficient for making men happy. […]Law and morality are therefore in need of being supplemented by divine rewards and punishments."
“If we must have an enemy at the head of Government, let it be one whom we can oppose, and for whom we are not responsible, who will not involve our party in the disgrace of his foolish and bad measures.”
- Alexander Hamilton. Spiritual father of #NeverTrump
"A woman is like a teabag, you never know how strong she is until she gets in hot water." - Eleanor Roosevelt
Keep your religion out of other people's marriages.
The answer is obvious: Of course our laws should reflect tradition, and do. That's the very thing that often lends them authority and credibility. The whole common law, which we inherited from England and which states have since modified by statutes, reflects traditional, customary views of the fairest way to resolve a given problem. Each judge would look to see how other judges had ruled in similar situations, and be guided by that accumulated wisdom.
"Men did not love Rome because she was great. She was great because they had loved her." -- G.K. Chesterton
Any action, traditional or not should be evaluated objectively on the basis of its actions and results. The preference for either the actions or results will of course have to be subjective.
I've seen traditions that used to serve a purpose but now are meaningless or even harmful such as throwing rice at a wedding, and I've seen ones that seemed stupid but ended up having a beneficial side effect which could be addressed directly, such as no kissing on the first date (fast relations can more easily fail) and I've seen smart traditions. But in all cases the merit of the specific act is what is important