Yes, we choose who we will partner up with in life. The thing is, people change and sometimes people make decisions that make it extraordinarily difficult for their married partner to remain with them. Sometimes people change and flatly reject and replace their married partner. That's a 'saddled with' situation whether we like it or not.
While I agree with everything you posted, it's not relevant. You can't hope to mandate that level of commitment among people. It's not realistic. It's good that you and I, and others, live that way. But no fault divorce is the best solution out of a series of bad choices. If two people don't want to have anything to do with each other, and have no interest in working things out (and I can imagine a circumstance where some folks might not be interested in the commitment to work it out), they should go their separate ways.
Any other answer is uncivilized or immature.
Oh, I totally agree, I just wish it were different. I think one of the most important things that my mom told me was that she didn't love my father every single day. Sometimes she hated him and didn't think she could stand to be married for even one more day! But...she got over it. They've been married 40 years.
I'm not sure I would have been as persistent in my own marriage had I not understood that you could feel that way sometimes.