What a weird take. You're not rewarding anybody. You're choosing who will be the next president. You're making a choice that will affect you and millions of other people.
I said previously I expect people to vote intelligently. You seem to be implying that allowing Trump to win just to spite the Democratic party for choosing Biden is somehow a rational choice.
You brought up blind arrogance.
Imagine being so blind that you fail to see that the outcome of a Trump victory would be devastatingly worse for yourself and for the world. That you'd be supporting an outcome that leads to more and worse genocide, despite that being a "single issue" for you. That's blind.
Imagine being so arrogant that you'd choose the path that leads to more genocide and greater global suffering, despite genocide apparently being a "single issue" for you, simply to punish a political party made up of millions of people because they didn't field the candidate you wanted them to. You said yourself: "The Democrats have a membership of millions." Yet you are the one stamping your feet and threatening that if they choose Biden, you're going to vote against him just to spite them. And help bring about more genocide, despite that apparently being important to you. That's arrogance.
You don't have to like Biden, you just have to prefer the outcome of a Biden victory over the outcome of a Trump victory. It's akin to choosing between lima beans or rusty nails for everyone's dinner. You don't have to like lima beans, but if you are so arrogant to choose the rusty nails for everybody because you don't want lima beans, you're blind to how you will hurt others and yourself.
I'm sorry man, but you need to take a big step back, read everything that you wrote, and apply it to your own position. Then think on the actual outcomes that the two paths before you lead towards.