From all the concern trolling I see in the other instances it's clear that there's no winning over these people. Everything is "Kremlin propaganda" to them. I do think a lot of chapos did go a little overboard with the PPB, but even thoughtful responses were met with the "hateful rhetoric" and "Kremlin talking points" BS. As always, it is to the Global South we must look to for any hope in the future...
To be fair to Marx though, he lived through a time of revolutions where it looked like France and Germany were about to pop any day. Places in the imperial core during Marx's time did have things like frequent uprisings, like the revolutionaries in Paris were what inspired the writing of the manifesto.
Marx had high hopes for the USA too, but that was a standard opinion at the time. Lots of German socialists came to the US to start little utopian experiments in places like Ohio.