There's been a lot of discussion in this thread about whether or not your examples are valid. But there seems to be a more substantial problem: Your primary example, of whether or not decolonization was a good thing or was handled well is extensively discussed in academia. Similarly, most of the people doing ev psych are tenured professors and the like. So whether or not the views expressed are accurate, the claim that they are ignored by academia seems to be false.

Now, moving on from that, let's look at your claims.

Then there is evolutionary psychology, which tells us that Archie Bunker was right about nearly everything,

Is this a statement about racial groups or a statement about gender relations? I can't quite tell which was intended. Note that ev psych doesn't really say that much that Archie Bunker would actually agree with. Is this intended for rhetorical effect? If so, can you please state this more explicitly.

For a thousand years before the mid nineteenth century, pretty much everyone agreed that equality between husbands and wives would destroy marriage and fatherhood. Then in the nineteenth century, they introduced marital equality. Observe the result.

The request for citations below for the first sentence has already been asked and hasn't been really answered. (I will note that the Talmud which is a series of texts known for debating almost everything about its own legal system has nothing at all saying that equality between the sexes would destroy marriage). But aside from that matter, there's really a pair of pretty easy explanations for the "breakdown" of marriage.

First, in many places, common law marriage (really sui juris marriage), which really wasn't much more than acknowledged long-term cohabitation, was considered marriage. As that became less acceptable in the 20th century, people who if they had lived a century before would have been considered married were no longer counted as married.

Second, lifespans went up. In the 19th century, many marriages ended at an early age with the death of a spouse. See here. This data isn't ideal for this purpose because they are calculating life-expectancy of everyone which means that the decline in infant mortality also comes through. But in general, life expectancy has gone up. Divorces have become more common as a means of ending marriage, but the actual length of the average marriage is not that different from what it was in the 19th century.

There is an argument that equality between males and females has also lead to higher divorce rates. And it probably helps that females can initiate divorce (something that was difficult to do in some places in previous centuries) . It also obviously didn't hurt matters that rising equality made it easier for women to live on their own, which made getting a divorce have fewer downsides. But the claim that equality in marriage itself led to a decline in marriage seems to be extremely weak to the point where the correlation so obviously doesn't imply causation that it is almost a textbook example of that problem.