The hot air of hypocrisy
Demand agreement on a divorce settlement before you marry, and the world may believe many things of you: that you are prudent, or cynical, or just a bit mean. What it will not believe is that you are a swooning romantic, moved only by the high ideals of love. You can boast you are an idealist, in other words, or you can make a pre-nuptial agreement: you cannot plausibly do both.