Politics is a matter of cycles, mostly
Offer and demand, or put differently;
Hard times create strong men,
Strong men create good times,
Good times create weak men,
Weak men create hard times.
...
Take anti immigration parties for instance, they wouldn't score if there weren't issues with immigration, there wouldn't be a need for those anti immigration parties without those issues
Take blue collar workers, the harshness of their working conditions was the breading ground for marxist movements. But once these working conditions/wages improve significantly, when blue collar workers become white collar or when their children become white collar... They start to vote differently for the most part, the ranks of the parties defending blue collar workers' interests start to shrink, naturally
When the system serves the interests of a few at the expense of everybody else, at some point, anarchism tend to become a common ground for the majority, because everybody start to have an interest on bringing down the existing order, entirely, and start over
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