Onchocerca volvulus is a nematode worm that spends most of its life in the tissues of a host organism. In humans this can lead to the condition onchocerciasis, which manifests itself as severe skin and eye itching and often leads to visual impairment or permanent blindness. According to the wiki entry
onchocerciasis is the second leading cause of blindness in the world. The first is trachoma, also caused by a parasitic organism - a bacterium in this case (the same little bugger that cause chlamydia).
If you take the existence of nebulae, rainforests, the seasons, in short the beauty and complexity of the natural order as evidence of a creative and intelligent God then what do you make of the existence of a little roundworm that lives in lesions in the eye and cause the blindness of millions of children every year?
If the green grass and the blue skies suggest that there is a God and that he is great and that he loves us doesn't onchocerca volvulus point to a cosmic sociopath?
Nightmare fuel:
List of parasites of humans - Wikipedia
I've spent a lot of time writing about the African Eyeworm (Onchocerca volvulus), the leading cause of blindness in the world. Hundreds of thousands of eggs per day hatch when they are in the intestines, and, because humans are likely not the original host (possibly extinct for millions of years), the larva migrate throughout the body seeking the intestine of its original host (which it can't find in the human body). So, they migrate into every part of the body (through the heart, lungs, etc). When they enter the eye, body tries to kill it with antibodies, and those antibodies are the cause of eye damage (not the worm, itself). They call these worms "larva migrans" because they travel throughout the body. The worms can be seen by the naked by (or magnifying lens) inside eyes (not to be confused with vitreous floaters which can sometimes look like worms). It is called volvolus because it looks like a woman's body part, including stripes which look like crinkles.
The worms, while crawling just under the skin, cause itching so severe that some commit suicide to end it. They get stuck going over bones, so form nodules by elbows (and other places). To diagnose, those nodules are cut off (painfully, without anesthesia, which would knock out the worms), then put into a liquid to watch if worms come out. The Guinea and Ghana studies (which I read 20 years ago, so I'm a bit rusty) detailed the search for medicine to cure the infestations.
Humans are human-centric. We think that everything is made for us. Have you considered that humans are made of meat, and a lot of organisms eat meat? Could it be that we are worm food? Maybe the world is made for the worm?
I see your point that God made a world of organisms eating each other (sometimes a water buffalo may scream in pain as a lion eats it alive). It is, indeed, a cruel world.
President Jimmy Carter wanted to eliminate the Guinea worm. It sticks its head through the skin to breath, usually by the ankles. Africans usually tie a string around that head to slowly pull the worm out over a period of months. Through millions of years of evolution, it has evolved to fool the human immune system, so it won't be attacked. But don't we have a use for such an ability? What about eliminating rejection of artificial hearts? Currently, those mechanical hearts are made with a rough surface that gets human cells to stick to it (making it appear to be part of the body), but still there is rejection (despite anti-rejection drugs). We should not exterminate the worm, but confine it to labs for study. But that would lead to bio-warfare labs and accidental escapes of pathogens, which some people claim occurred with COVID at the Wuhan Institute of Virology (which wrote a research paper in 2015, published 2020, about creating a bat coronavirus/SARS gene spliced hybrid that attacks Hela (human lung cells in a petri dish) and has a 96% DNA match to the current COVID virus (source: Wikipedia, Wuhan Institute).
Follow Christ and cure all.
It would behoove us to eradicate human pathogens (things that can harm us) around the world. Why should we spend our money to help someone halfway around the world? Because what goes around, eventually comes around to us. Take, for example, tuberculosis. The US eliminated it through the US, and almost the entire world. It mutated, and now is antibiotic resistant, and coming back with a vengeance. If it had been eliminated around the world (perhaps with some held in labs), we wouldn't be in these dire straights. This is why following Christ is such a great idea.
We have an odd political alliance. Religious Right Christians vote for Republicans, and Republicans are for "me first." They generally vote for the billionaires (H. Ross Perot, Malcolm Steve Forbes, Donald Trump), and most of those cut taxes for the rich (promising trickle down to the poor, which never happens....just factories outsource jobs for cheaper labor, increasing unemployment). So, universal health care (where everyone can get cured) is voted against.
Christians vote against Christ.