Women's suffrage (and suffrage in general) may be a good idea. When you say that the case for it being a good idea is as strong as that for a mathematical proof, you're discrediting yourself, since you're smart enough to know that political ideas can never achieve the rigor of proof.

you are clearly missing the point of this conversation. The point of this conversation is not to claim that 2 times 2 is equal to women's suffrage, but to simply state the obvious: when somebody says something that sounds pretty obviously idiotic, the likelihood that this person actually is an idiot goes up dramatically.