Ironically, you are positing a grand unifying theory here by stating that detractors from mainstream opinions just want simpler answers. But isn't it simpler to just go with the mainstream opinion and go with the flow? Alternative models of the earth are typically rooted in Biblical or ancient belief systems. Any specific argument based on physics come long after a person's acceptance of, e.g., the Bible. And I can't even imagine how you might think anti-vax beliefs are simpler so I can't speak to that. Homeopathy sounds pretty dumb to me, sure, but also there are tons of reasons to distrust the medical system in the USA, I'd be surprised if anyone seriously argued against that. I can understand why people suspicious of America's medical culture of prescribing 10 medications to someone instead of lifestyle changes might see a bottle of sugar pills at the store labeled with "natural remedy" and think it could be a better alternative.
> Every new observation has completely overturned the predictions of every MOND or modified gravity theory, and they just come back with a totally different explanation to fit the new data.
That's how science works. Scientists are not prophets, they do not have the luxury of starting with all the answers. It's really disheartening to see you make these theories into an "us vs them" ego contest.
I'm guess I'm just a dyed-in-the-wool agnostic, but when I hear someone suggest an alternative theory I don't immediately feel the need to group them with everything I think is wrong with the world. Instead I think, "That's really cool they came up with a different model of the universe. I wonder how they account for everything we observe and how it will be refined over time and whether it will predict new discoveries." Even if your current theory never gets overturned, I think your attitude is a perfect example of why science is said to advance one funeral at a time. Just because they got it wrong in the past doesn't mean they can never get it right, and it doesn't mean there's a 100% certainty that you got it right.