Straight couples don't have to be monogamous to be married or married to be monogamous. Monogamy no more defines marriage than the presence of children does. Monogamy isn't compulsory and its absence doesn't invalidate a marriage.
That a marriage ends is less than ideal but all things end under heaven and if temporality is held to be invalidating then nothing real succeeds.
The problem for those who assert biblical authority in support of traditional definitions of marriage is that one could with equal validity assert that the lending of money or certain kinds of haircuts are forbidden by God or that slavery and the subjugation of women are authorized by the Lord.
A man's friendships are like his will invalidated by marriage - but they are also no less invalidated by the marriage of his friends.
If this validates anything it's that learning how to bunt and hit and run and turning two is more important than knowing where to find the little red light at the dug out camera.
Bottom line is I didn't return to Apple to make a fortune. I've been very lucky in my life and already have one. When I was 25 my net worth was $100 million or so. I decided then that I wasn't going to let it ruin my life. There's no way you could ever spend it all and I don't view wealth as something that validates my intelligence.
I think the materialist conception of history is valid.
Two hundred years ago our Founding Fathers gave us a democracy. It was based upon the simple yet noble idea that government derives its validity from the consent of the governed.
The valid research for the future is on the inner side on the spiritual side.
I shall go further and say that even if an examination of the past could lead to any valid prediction concerning man's future that prediction would be the contrary of reassuring.