Go back a little more.
Most wars were started for church and,or king.
Poor people have been fighting and dying for their rich oppressors for all of human history.

Socialism is recent, but in practice, without democracy to check them men in power usually turn to authoritarian violence.

Not a left thing, a power thing.
What stops it is Democratic ideas.



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"The truth is incontrovertible.
malice may attack it,
ignorance may deride it,
but in the end,
there it is." -Sir Winston Churchill