Earlier quoted context omitted.
> What evidence do you have for this? I've never seen a bad or immoral or harmful idea die out when more people learn about it and scrutinize it. There is a significant amount of evidence for it. For example, one could measure the effects of showing people fact-checks, and it has been demonstrated that it does indeed work: https://en.wikipedia.org/wiki/Fact-checking#Effects And there are countless ideas that have die…
> flat earth (before Galileo) That people thought the Earth was flat before Galileo is a meme. Even Ancient Greeks knew it was round. > pro-slavery views In 1776, America is born with its Freedom(TM). In 1829, Mexico abolishes slavery. In 1835, Texas revolts, resulting in Republic of Texas (1836), which then merges with the US (1846), which triggers the Mexican-American War (1846-1848), which leads to, among other th…
Well knowledge wasn't spread as easily, and could be lost. People knew, then they didn't and so on. It doesn't detract from my point that flat earth is an example of an idea that died off when more people learn about it and scrutinize it.
> In the end, slavery wasn't abolished by debates: it was abolished by literally sending troops to shoot slave owners.
Abolishment of slavery took many angles since it was a massive change of society. Sure, you can pick one country where it required a war. But that doesn't mean the battle of ideas aspect is any less important. Even to rally troops you need to convince them their ideas are worth fighting for.
> (communism) still accepted widely enough to turn Russia into Soviet Union
Sure, and then we saw the results, and the bad idea died off (mostly)