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Part of the reason why the dominos did not fall was that it extracted a very high cost. Vietnam was devastated by the war. Same thing with Cuba. Although not a direct invasion, the US sanctions on Cuba extracted a high cost.

Sometimes resistance can make a slope less slippery. With Donald Trump’s election in 2016, I believe the US was on a slippery slope to a very bad place. A lot of stuff were being normalized that should not be (overt racism). However, there was a lot of opposition and resistance which has probably helped stabilize the situation.

So no, just because a lot of resistance keeps you from sliding down the slippery slope, it does not mean the slippery slope is not real.