You have 20 apples that you put into 5 boxes. "How many apples per box?" 20/5=4. Easy.
You have 20 apples that you put into half a box. "How many apples per box?" 20/0.5=40. You can see how 20 apples in half of a box implies 40 apples per full box.
You have 20 apples that you don't put into anything. "How many apples per box?" 20/0=? What box? What are you talking about? How can you suggest that there are a number of apples per box when there's no box to begin with? Lunatic!
Two candidates that support genocide, but one is a christofascist. No matter who you vote for, genocide support wins. But you think it's better to give the christofascist better odds than to inconvenience yourself with a vote you don't 100% agree with, and possibly abstain from your chance to ever vote again. Not voting won't fix the issue, since there's no threshold on voter turnout for the election to count. The struggle against genocide must be fought in other ways. So unfortunately, this fall you're getting genocide, so please make sure you don't get fascism too.