I live for a high disagree-to-upvote ratio
Conscription in particular seems really bad; if your country is undertaking an offensive war then it’s probably completely indefensible, and if it’s a defensive war then defending your country should be self-evidently valuable to enough people that you wouldn’t need it.
I also don’t think that even defensive wars hold killing to be morally good—otherwise you would see more situations where one side murders combatants who have been disarmed. Instead, most countries have historically imprisoned them or let them go. This seems, at least, consistent with peacetime ethics around imprisonment?
I can’t speak to sub-Saharan Africa, but in India the government have put together a very comprehensive survey of mental wellbeing, which they ran in 2016 and are running again now. They randomly sampled households across the country, and asked people about their feelings and symptoms, which they then categorised into different mental conditions, rather than asking directly. This found results that largely concurred with previous GBD estimates for India. But I can’t say for sure whether there might be other biases, and there are almost certainly issues with the GBD’s Africa estimates due to a lack of ground truth data in many regions and methodological issues.
Here’s a paper on the kinds of surveys and interviews used to form the GBD prevalence estimates, and here’s one arguing that prevalence is sharply underestimated.
5% of Americans identify as being on the far left
However, I would strongly wager that the majority of this sample does not believe in the three ideological points you outlined around authoritarianism, terrorist attacks, and Stalin & Mao (I think it is also quite unlikely that the people viewing the Tik Tok in question would believe these things either). Those latter beliefs are extremely fringe.
I’m a little confused about your problem statement, indeed, most of the extreme politicians in the U.S. seem to win outright, in ranked-choice primaries, or systems with two-candidate runoffs.
In the Democratic party, which I’m more familiar with, their most extreme (this is not an endorsement or disendorsement of their policies, just to note that these politicians are the furthest left in the party) elected officials tend to win outright majorities or in reformed elections:
Similarly, I skimmed the Wikipedias for a few far-right politicians, whom I’m less familiar with, and they demonstrated similar trends. MTG, for example, won a contested primary with 40%, but then won a two-candidate runoff and has seen outright wins since.
It seems as though extreme politicians are genuinely popular—enough that people don’t form coalitions to oppose them in future elections, even when there’s only one other candidate on the ballot. I am not very convinced that your proposed form would work.