Hmmm...
I have some different takes than the person interviewed in that video.
Assuming the christian god is real---
The apparent modus operandi for this entity is not exactly "maniacal", any more than a math teacher presenting his students with really hard calculus homework, assigned as a group project.
EG, seeing said kids with eyeworms, who are sure to go blind without treatment, SHOULD compel you to action to save the child's sight. Without the presence of the eyeworms, or any other adversity, there would be no motivation to be altruistic.
The christian god does not want robotic worship-slaves, it wants free minded adherents who want to learn the spiritual mysteries of the universe, into which he can safely impart said mysteries.
Parables, such as "he who can be trusted with little can be trusted with much" apply very keenly in this interpretation, as does the promise of what it means to be in heaven in Revelation. ("We shall know him, for we shall be like him", implying that the goal is to become little gods ourselves.) The idea is to present smaller, solvable problems, for humanity to solve, so that people understand adversity in a real sense, so that they are willing to prevent it in others.
I very much reject the "God should pamper my pitiful mortal butt-- He would give me everything I want, and never punish me at all, IF HE REALLY LOVED ME!" line of thinking when it comes to approaching the hypothetical of the christian god existing. Amusingly, that seems to be the tact used by the person being interviewed-- "Why did you make eyeworms?" "To test you, to see if you would pluck them out, before I give you the power to make worse things yourself." (with the unspoken truism, that since you are here, AFTER having freaking DIED, those eyeworms were not a permanent thing anyway, and your accusations of capriciousness fall flat because of that. The bible states emphatically that the mortal, fleshy existence is temporary, like the training wheels on your bike, or like being "it" when you play tag. The christian god does not smite eternally until AFTER your testing, and then the smiting is to remove people who would abuse the powers of imortality and pseudo-godhood for flagrantly selfish and wicked purposes. He introduces small evils into a testing chamber (mortal existence) to see if you will love wickedness, or love altruistic goodness instead.)
Granted, that is entirely hypothetical.
My personal take is that if a god exists, it does not interact with the world, and it is running on pure cause-effect feedback. There are nutrients in eyeballs, the tissue is soft and moist, and it makes sense for parasites to evolve to exploit that. God created the framework, the lifeforms created themselves. There would be pretty compelling evidence of tampering if such a being did actively meddle with the world. Evidence that is curiously missing. So, I think it more likely that if a god exists, it is an absent one; it does not interact with us, except maybe to watch us, like a scientist does.