If you need a prenup to marry, don't marry.
A lot of the reason people get divorced is over mindsets indicated in this thread. Pessimism that it won't work combined with the importance of money over relationships.
A guy who shouldn't have gotten married to begin with will say fvck her look at all this money I lost. A guy who is more marriage material will say yeah she cost a lot but I still have a lot and more importantly, my marriage just fell apart, that sucks more than some money lost.
If you need to have car insurance, don't buy a car. Is that your logic? It's not about being pessimistic and about being prepared for a possible divorce.