"Not endorsing my candidate is the same as endorsing my opposition!"
Hey, welcome to a FPTP system where two candidates have near-majority support from the electorate! Sorry that you think that welcoming fascism and genociding minorities is worth you feeling smug about yourself when you fill out your ballot!
Your toddler isn't one out of many voters. If your toddler understood that advocacy for broccoli was the difference between him having to eat broccoli and him having to eat liver, I'm quite sure that his advocacy would be quite vociferous.
Your toddler is not a citizen with a share of the decision-making responsibility, and it's concerning that you choose to reduce your agency in this example to such an infantile state.