And the reason the very same is happening in the USA is also gay marriage? Oh wait...
How do you see "no fault" divorce as contributing?
Good point on Denmark.
In fact Europe is so libertarian on social issues that they will soon finish off their 1500 years of history. In roughly 30 years, there will be enough young Muslims to start civil wars and hold territory. In 50 years, the remaining (and old) white Europeans will either be defeated or have fled (or have fought back earlier in a way that makes World War 2 look like a kindergarten fight - but that's unlikely).
The reason for all of this is that European society has jettisoned its need to perpetuate itself, and now has virtually no kids being born to whites, and huge numbers being born to Muslims (not to mention immigration).
Their are many reasons. Guilt (over their glorious past) is a big one and may drive other things, such as: Legal gay marriage (which cannot produce children); huge incentives for women to work, rather than have kids, and probably lots of other reasons.
The reason that treason is specifically called out as a crime in our constitution is that it is a threat to the continuation of this country. One could arguably make the case that gay marriage is also threat, and the courts could outlaw it on that premise - but all we ask for is to let the elected representatives decide the issue. This is not hard to understand and anyone who thinks courts should be imposing new forms of marriage without specific legislation being written should be jailed (in my opinion).
Libertarian ... ???
I worked long and hard starting in the 1970's to undo the "marriage tax". Tell me sincerely such a tax will not again be possible under the proposed marriage amendment. Also tell me how my position against the "marriage tax" fits you libertarian label.
The same-sex proponents repeatedly cite "same benefits" when hashing over the issue, and they specifically mean government benefits more than any other.