A prenup doesn't make divorce more of an option. No one starts a marriage thinking they'll divorce. But both of us come from divorced parents so we're not naive that it COULD happen to anyone. 
If the incentives of a prenup are setup to make it easier to leave then you have a fucked up prenup. In our context, I have multiple businesses that revolve around my home because it's farming, I also will inheret property from my family. In the prenup I really just want the house and the businesses to remain mine because otherwise I would have to start a new farm from scratch which in my mind means I would simply leave farming. All of the other assets built up during the marriage still become common property, but the things I had before aren't. 

Round number example, cash stored in the mattress) . 
If I had 100k before the marriage, then 10 years into the marriage I have 1 million. I basically would leave with 5.1 million. This is fair.