What I think is different this time is the process on coming to a "generally accepted conclusion". Take the Iraq WMD issue. At the time, the status quo was that Iraq had WMDs, even if there were plenty of people arguing against that - those people may have been "marginalized" as you put it (though not sure I agree - I was one of those people, and while I clearly the tide was against my viewpoint, I still felt we were having a debate over facts), but they were still arguing that there was little evidence for WMDs. But when the facts were cleared up, there was broad agreement "OK, the evidence is now clear, this is what happened".
My point is now that even when the clear picture does finally emerge, you have plenty of people still just willing to repeat the falsehood in the belief that "if you repeat it enough, it becomes 'true' enough to enough people." That's what feels different to me, at least in my lifetime.
I understand the structure of your argument but I am not sure I can relate it to things that are happening. Can you give concrete examples?
But still you have large swaths of the American populace (including, notably, the president elect) saying that no, Trump won the 2020 election. At this point, though, I don't even really see them putting forth any argument based on actual evidence that Trump won in 2020. It's just repeating the same platitudes of "it was stolen, the politicians are corrupt, ..." etc. etc. But it's like many people just accept now that this is an acceptable way to argue things, "if you repeat it enough, you get to have your 'alternative' facts" - like, they don't even really care that much that they don't have actual evidence to back up their position. That is the part that feels relatively new to me.
This happens in two countries, that I know. One of them is the US, the other is Costa Rica. I expect it to happen in all countries with important xenophobic populations.
This is my favorite theory of what happened:
Iraq perceived Iran, and internally Shiites and Kurds, as its real and threatening enemies. USA was perceived as being far away and weak. To keep their real enemies scared, Iraqis kept up the illusion of having a solid WMD program. Iraqis would hint at their WMDs when communicating with their neighbors.
From the point of Western intelligence, the intelligence picked up Iraqis talking about their WMDs when Iraqis didn't know being listened to, and when Western intelligence assumed that Iraqis had no reason to lie. While there was no physical evidence of the WMDs, this was perceived as a rather reliable intelligence. Why would Iraqis talk about their WMDs in secret, if they didn't even have any?
"Failing to understand the Iraqi leader’s mindset and the context of his decisions, the intelligence community assumed that Iraq’s ongoing denial and deception operations regarding his alleged WMD programs, despite periods of genuine cooperation were ipso facto confirmation that Iraq was hiding WMD caches and programs."
"It appears that the intelligence community never seriously considered the possibility that Baghdad was conducting its denial and deception operations to hide weakness."
https://www.airuniversity.af.edu/Portals/10/ASPJ/journals/Ch...
Its genesis was at least the mid 1990s per: https://en.wikipedia.org/wiki/A_Clean_Break:_A_New_Strategy_...
And then this group got more power under Bush's term and 9/11 happened and they responded by pushing for the Iraq war and got it:
https://carnegieendowment.org/research/2003/03/origins-of-re...
https://www.foreignaffairs.com/iraq/what-neocons-got-wrong
The WMDs were a convenient cause belli for the masses, but it was not the motivator for the war. This is why no matter how much doubt was created about the WMDs before the war, and there was tons and tons, there was no stopping it.
At the risk of being that guy, the term you're looking for is casus belli: https://www.merriam-webster.com/dictionary/casus%20belli
You've misspelled it at least twice so far, otherwise I wouldn't be bothering you about it.
I haven't noticed that. Generally I find it decent.
I think that helps demonstrate the parent's point. I think it is very much established fact now that there were no weapons of mass destruction. Can we say the same thing about anything that has happened since, certainly in the last 5-10 years? There have always been some dissenters, a small band of conspiracy theorists that would doubt even something as fundamentally true as a non-flat Earth. But now the group is much more sizable.
Edit: since writing this comment, I see that hn_throwaway_99 posted a reply of their own which pretty much matches what I said.
I am not sure it is actually difference.
In the lead up to the Iraq War in 2003, there was so much discussion in the media about how Iraq had weapons of mass destruction and those saying it was made up were marginalized. In the end those doubters were right.
I think in Vietnam, there was similar misleading statements about cause belli e.g. Gulf of Tonkin Incident: https://en.wikipedia.org/wiki/Gulf_of_Tonkin_incident I think that there is often disagreement on facts.
I think with Wikipedia existing, we are actually in the gold age of grounded truth.
There is always a sizable segment of the population who doesn't really care for truth though and they will just align with their side and be angry. This happens on all sides of the political spectrum. In the past this was pushed via https://en.wikipedia.org/wiki/Yellow_journalism and is still pushed via similar outlets today.